
Wanted: Police have issued an appeal to catch this ISIS suspect, seen on CCTV footage dressed in a white shirt and jacket and wearing a dark hat as he pushed a luggage trolley through the airport minutes before two bombs rocked Brussels Airport

A jihadi bomb suspect calmly walked out of Brussels Airport yesterday moments before his two accomplices massacred 14 people in a double suicide bombing, officials believe.

Three ISIS attackers said by the terror group to be wearing suicide vests were seen on CCTV wheeling suitcase bombs into the busy check-in area just after 8am local time (7am GMT) after arriving in a taxi.

Two of the men, who were pictured wearing black gloves believed to contain detonators on their left hands, exploded their nail-shrouded devices in the first of twin terror attacks on the Belgian capital that left at least 34 people dead.

U.S. officials who studied the CCTV said the third bomber had already abandoned his bomb and his departure from the airport 'appeared to be planned'.

Less than 80 minutes later, a further blast on a Metro train at Maelbeek station - near to the EU Parliament building - left another 20 people dead.

It was unclear whether the missing airport suspect was responsible and Belgian police were last night 'actively searching for' Europe's most-wanted man, who had been wearing a white coat, glasses and a hat.

Other reports suggested the 'man in white' fled the airport after his devices failed to detonate. The Belgian army was said to have found and neutralised his abandoned suitcase and a suicide vest left at the scene.

Belgian police launched a major manhunt to find him as ISIS claimed responsibility for the massacres, which killed 34 in total and injured 200.

Local mayor Francis Vermeiren confirmed the ISIS suspects checked in their explosives-packed suitcases just seconds before the atrocities.

He said: 'They came in a taxi with their suitcases, their bombs were in their bags.

'They put their suitcases on trolleys, the first two bombs exploded. The third also put his on a trolley but he must have panicked, it didn't explode.'

Belgian newspaper HLN said a taxi driver told police he believes he unwittingly drove the bombers to the airport and was abruptly ordered not to touch their suitcases when he offered to help them with their luggage.

The two men whose suitcases successfully detonated – blowing themselves up in the process - were wearing gloves on their left hands, which security sources say would have hidden the triggers for their explosives.

It is a similar technique said to have been used by the jihadists who carried out the sickening Paris massacres last November. Witnesses to the attacks on the French capital, which killed 130 people, told in the aftermath how they saw the attackers holding a detonation mechanism in their hand with a cord travelling to a suicide vest.

The third Brussels suspect fled the terminal before the carnage ensued and U.S officials believe his calm departure indicates he may have planned all along to leave before the bombs exploded.

Belgian police have issued a 'wanted' poster showing him wearing a light-coloured coat and black hat while wheeling his suitcase on a luggage trolley.

'Police are looking to identify this man. He is suspected of having committed the attack at Zaventem on Tuesday March 22,' a police spokesman said.

A string of anti-terror raids were carried out across the Belgian capital last night, with police confirming another nail bomb, an ISIS flag and several 'chemical products' were found at a house in the Schaerbeek area which was searched in connection with the terror attacks.

First picture: These three men, pretending to be air passengers, are believed to be the terrorists who carried out the Brussels Airport attacks. The two suspected suicide bombers on the left were both wearing black gloves - which the Belgian media says would have hidden the triggers for their explosive vests. The third suspect in the hat is believed to still be on the run after dropping his nail bomb

Close up: One of the two men at the airport who was pictured wearing a black glove, believed to contain a detonator on his left hand

In detail: The other man said to have had a detonator, who later exploded his nail-shrouded device at Brussels Airport yesterday

Cover: Belgian police are 'actively searching for' Europe's most-wanted man, who had been wearing a white coat, glasses and a hat

Police swooped on a number of suspects but the Belgian Foreign Ministry said many of those behind the chilling terror plot are 'still at large'.

It emerged as the world comes to terms with yet another deadly terror attack in Europe - just four months after 130 people were massacred in Paris.

In all too familiar scenes, terrifying photos showed bloodied victims and maimed bodies after two bombs were detonated at Brussels' main airport.

An eyewitness said the blasts were so powerful that victims were thrown in the air, leaving the floor strewn with bodies, limbs and debris. Among the 14 dead was said to be a man holding a baby.

There were reports of gunfire and shouts of God is great in Arabic. Police reportedly later found two AK-47 rifles and an unexploded suicide bomb vest.

Just 79 minutes later, commuters on their way to work lost limbs as a third bomb tore apart a train carriage on the Metro line in Maelbeek – killing 20 and injuring more than 55, including 10 critically.

Horrifying pictures, many of which resemble the heartbreaking devastation seen in the wake of the London 7/7 bombings, show innocent commuters covered in blood and sprawled out on the floor after being targeted in the attack. One survivor said it was like the 'apocalypse'.

Panic: A fire caused by one of the explosions in the terminal is tackled by airport staff with extinguishers surrounded by baggage and falling roof tiles

Obliterated: Ceiling tiles and debris are littered across the floor of the terminal building after twins blast rocked the check-in area

A soldier walks through debris after two explosion rocked a terminal building at Brussels Airport - but security sources say Belgian police already have CCTV of at least one bomber and the explosion

Europe now remains on high alert amid fears of further attacks from ISIS, which has already threatened to hit the UK 'harder and more bitter'.

In a statement released following the Brussels attack, the terrorist group said on its official Telegram account: 'We promise to the states that are allied against the Islamic State that they will face dark days in return for their aggression against our state.

'And what will await you will become harder and more bitter through the grace of Allah.

'In praise of Allah who has made our blows precise and helped us succeed. we demand for him to accept our brothers among the martyrs.'

Brussels remains on lockdown today with police desperately carrying out a series of anti-terror raids in a city which has already been deemed a 'clearing house for jihadism'. More jihadis have travelled from Belgium to fight for ISIS in Syria and Iraq than have gone from any other European country.

In the wake of November's Paris massacres, it emerged that those behind the attacks masterminded them from Brussels leading French media to heavily criticise the Belgian authorities.

Bomber Salah Abdeslam, who was finally arrested on Friday, had links with the Brussels district of Moelenbeek - an area with a large North African population - whose mayor once described it a 'terrorists' den' because of the number of jihadists living there.

In light of the Brussels attacks yesterday, two men were arrested at gunpoint outside the city's North railway station, a mile from the Maelbeek subway.

Another man was also taken into custody by armed police at Brussels South railway station near the suburb of Schaerbeek.

German media reported that three men were arrested on suspicion of terror offences on a motorway between Munich and Salzburg.

The men were said to have been Kosovans who had travelled from Brussels, and the Office of Criminal Police of Bavaria said inquiries were ongoing.

Another person was also arrested on a train near Amsterdam, while hours later shots were fired at the Dutch capital's main train station during an arrest attempt. Police later confirmed the arrests in Amsterdam were not related to Brussels and the suspects were detained on suspected drug offences.

A suspect package found at Gard du Nord in Paris also delayed Eurostar services yesterday afternoon.

Fires burn among bags and debris as passengers flee the terminal in the immediate aftermath of two explosions at the check-in desks

An person is carried to safety as troops helped the injured and secured the area after the explosions in the terminal building

A man runs for cover: Witnesses described apocalyptic scenes with blood and 'dismembered bodies everywhere' after the two blasts

Terrified passengers run for their lives in a cloud of smoke moments after the explosions ripped through the terminal

Explosion: The image above is being used by the Belgian media who claim this is the damage caused by the bomb at the Maelbeek Metro station in central Brussels this morning. It has not been verified by the authorities but is being widely circulated on social media.

MailOnline earlier revealed that authorities already have CCTV of one of the Brussels airport bombers including the moment he detonated his bomb.

Every space in the city's airport is covered by four CCTV cameras, including the departures hall where at least 14 were killed.

Maelbeek station's surveillance network is also being used to pinpoint the moment that 20 people were murdered 79 minutes later.

Police are already trawling through hours of CCTV footage filmed before and after the deadly explosions as they hunt for those behind the attacks.

The carnage began at 8am yesterday when two metal-shrouded bombs were set off in the check-in area of Brussels airport. A third unexploded suicide belt was found in the rubble. Just 79 minutes later a bomb blew up an underground train.

Shocking images from Maelbeek station show the mangled remains of the train, smoke pouring out of the building and casualties littered on the pavement outside - just 400metres from the EU's headquarters.

The bomb went off at 9.19am - just over an hour after the two explosions killed at least 14 in a suicide attack on the Belgian capital's main airport.

Experts believe the bombs were loaded with metal shrapnel to inflict maximum casualties.

An X-ray image of a bolt inside the chest on one patient at a military hospital showed how they came with inches of death. Doctors at the Hospital Gasthuisberg in Leuven, east of Brussels, which treated 13 victims, said all the bombs contained metal objects.

Patients taken there suffered fractures, burns and deep cuts thought to have been caused by bolts or nails. Five of them were seriously injured.

At the nearby KU Leuven hospital, Dr Marc Decremer said 11 casualties were treated for serious injuries including three or four children. 'We have seen deep flesh wounds,' he said. 'That can be caused by flying glass thrown by the explosion, or by the bomb, or by particles in the bomb.'

The British Foreign Office confirmed two Britons were injured in the explosions, while three American missionaries from Utah were also seriously hurt.

A Foreign Office spokesman said: 'Embassy staff are providing consular assistance to two injured Britons and are ready to support any further British nationals that have been affected. British nationals should follow the advice of local security authorities and check our travel advice for updates.'

Mormon church officials said the three missionaries from Utah were Richard Norby, 66, Joseph Empey, 20, and Mason Wells, 19. Mr Empey is said to be recovering well after being treated for second-degree burns to his hands, face and head as well as shrapnel injuries.

Surrounded: Two men on their knees with hands on their head are held in Brussels as the authorities

Drama: Two men were pinned to the ground by armed police and special forces as the hunt for members of the terror cell behind the attack

Interventions: The arrests came as the authorities start to round up any people deemed a risk to the public, including here at Brussels North station - a mile from the Maelbeek bombing

Across the border: A suspect with his hands up is arrested as he is taken off a train because of suspicious activity at Hoofddorp Station in Amsterdam

Brussels' public transport authority has revealed that the three-carriage train at Maelbeek was ripped apart by a single explosion, with the bomb set off in its middle carriage. It is not known if it was a suicide attack or a planted bomb.

Christian Delhasse, the driver of the Metro train, told Belgian broadcaster RTBF: 'Seeing bodies on the floor, it leaves a mark on you.

'I did what I had to do. Nothing happened to me, no injuries.'

Commuters on the Metro at the time described hearing a loud bang before they were evacuated from trains and forced to walk down smoke-filled tunnels and along the track to the closest safe station.

TIMELINE OF TERROR: HOW THREE BOMB BLASTS ROCKED BRUSSELS 8am: Two explosions rock Zaventem Airport killing 14 people near the check-in desks 8am onwards: Terrified passengers seen streaming out of the terminal building in Brussels while flights are diverted to other airports 8.30am: Witnesses describe blasts so powerful that victims were thrown in to the air 9.19am: A third bomb blast rips through Maalbeek Metro station killing 20 more people 9.23am: Eurostar services in and out of Brussels are suspended 11am: Belgian prosecutors Fredere Van Leeuw confirmed that the three explosions were terror attacks 11am: Two suspects arrested one mile away from Metro Station blast 12pm: A Kalashnikov and unexploded suicide bomb vest are found in the rubble at the airport 1.50pm: Dutch Police stop international train from Brussels to Amsterdam at a station just one stop from Holland's Schiphol Airport as a precaution and search the train and its passengers 3pm: Belgian TV station reports at least one of the bombs at the Brussels airport contained nails 4.40pm: ISIS claimed responsibility for the attacks in Brussels Advertisement

A witness said: 'We left Maelbeek station towards the centre at around 9.07, 9.10, when we felt an explosion which appeared to come from the front of the train.

'The lights went off, there was panic given what happened at Brussels airport.

'The doors of the train were forced open to get off the train. There was a lot of smoke. We left via Maelbeek station. The glass doors were blown out. The explosion must have been enormous.'

Emergency services at the scene were carrying the dead and injured out of the station on stretchers.

Alexandre Brans, 32, who was wiping blood from his face, said: 'The metro was leaving Maelbeek station when there was a really loud explosion.

'It was panic everywhere. There were a lot of people in the metro.'

One eyewitness, Theo Vassilopoulos, said Maelbeek station remained completely closed off last night with police cars and officers still in the area.

The 36-year-old from Greece, who has lived in Brussels for seven years, described chaotic scenes as people poured out of the station following a bomb blast.

Mr Vassilopoulos, who works at the European Parliament with the Greek MEP Stelios Kouloglou, said: ‘It all started with a distant sound, we didn't realise what it was.

‘But a few moments later we heard people shouting and screaming so we went by the window and we saw lots of people coming out of the station. I saw some of them had serious injuries, head injuries, a lot of blood on their head, wounds on their legs.

‘We realised something was going on. More people kept coming from inside the station and some of them were in dusty clothes or their clothes were torn apart, so then we knew that there was an explosion or something bad.’

Some 20 people are said to have been killed at the Metro bombing at 9.19am.

Brussels resident Shigeo Sugimoto said he was one stop away from where the metro was hit and heard people shouting.

He wrote on Facebook: 'I am fine !! But i was in the metro when suddenly some one start shouting 'explosions!!! Evacuation!!!

'Ouch!!! I was just one station ahead before when explosion happened !!!!!!!!'

He posted pictures showing cars and people standing in the road and wrote: 'Maerbeek (sic) now apocalypse!!!'

Mr Sugimoto said he saw a man with blood on his face in the vicinity of Maelbeek station in the EU quarter, near the European Commission's main building.

He was at Arts-Loi station, one ahead of Maelbeek, and told the Press Association: 'On the ground, there were already people walking every direction to distance (themselves) from metro and the Belgian army were there trying to make people calm.

'I saw a guy, blood over his face, dragged by another person. Then police start blocking the street and I could only see ambulances go and come.'

Evan Lamos was among the thousands of commuters on tube trains this morning when the network was attacked.

He was two stops away from Maelbeek and the passengers on his train were evacuated from the carriages into a smoke-filled tunnel and then walked along the tracks to the exit at the nearest station.

He said: 'There was a dull thud. We felt a blast of air and my ears popped shortly afterwards. The Metro stopped immediately'.

Mr Lamos was told that there was 'an incident on the line', suggesting that a train may have been bombed.

Victim: A bloodied commuter is given oxygen and treated for a head injury on the kerb outside the Metro station where a train was bombed

Survivors: Commuters on the Metro at the time described hearing a loud bang before they were evacuated from trains (pictured)

Panic: Commuters in the Metro described a bang, and a rush of air that made their ears pop before they tore open the train doors and walked down the track to the closest station

Aftermath: A man lies stricken on the pavement as survivors kiss in relief after surviving the bombing, which has killed at least ten

Emergency: A victim is treated under a blanket to keep them warm next to a woman with a head injury as rescue workers treat victims outside the Maelbeek underground station

Bravery: People injured are treated, comforted and given water by the emergency services as they help the wounded

Ian McCafferty was on the Metro when the explosion took place in Maelbeek.

He told Sky News: 'I was getting off at the station before Maelbeek and we heard a very loud thud. The stations are much closer together than in London so we heard it clearly.

'Panic set in and people rushed off the train. We ran to the stairs and were met by soldiers who quickly evacuated the station'.

The explosions came just a day after the Belgium Interior Minister warned of possible revenge attacks after the arrest of Paris massacre suspect Salah Abdeslam in the city last week.

At the airport, shouts in Arabic were reportedly heard before the explosions which sent shockwaves through the terminal building, shattering windows, knocking roof tiles off the ceiling and sending terrified passengers running for their lives.

Samir Derrouich, who works at a restaurant in the airport, told MailOnline: 'The two explosions were almost simultaneous.

'They were both at check in desk. One was close to the Starbucks. It was awful. There was just blood. It was like the apocalypse.'

Photographs from inside the arrivals hall showed the floor covered in fallen tiles and dust as bloodied people hobbled out of the airport. Others injured were photographed lying on the floor.

Video shows terrified passengers running for their lives out of the terminal.

In the aftermath of the explosions at the airport, thousands of people waiting for flights this morning were penned inside the terminal as police sealed off the shattered arrivals hall.

A terrified passenger cowers under a check-in desk moments after two explosions rocked Brussels Airport in a suicide bomb attack

Passengers shield themselves under bags as smoke and debris fill the terminal in the moments after the twin blast at Brussels Airport

A police officer directs passengers in a smoke filled terminal at Brussels Airport after two explosions ripped through the terminal

Firefighters search the terminal for explosives and survivors (left) as Brazilian-born basketballer Sebastien Bellin lies injured on the floor

Carnage: At least eleven people have died and several injured after two explosions rocked Brussels Airport in a suspected terror attack

Injured passengers are covered in blood and dust after the explosions in the terminal building

Shouts in Arabic were reportedly heard before the explosions which sent shockwaves through the terminal building, shattering windows

Blown out: The explosions sent shock waves through the terminal building, shattering windows and knocking roof tiles off the ceiling

Hundreds of terrified passengers ran from the terminal, some of them covered in blood, after the blasts rocked the building at 8am

Blast zone: The two bombs are believed to have gone off in these areas of the arrivals hall, as thousands were checking in for flights

Firefighters who entered the shattered building are said to have found a third unexploded device. This has since been deactivated at Brussels airport, an official said. Reports this evening also suggest a fourth undetonated bomb was also found after further searches among the rubble.

People already checked-in were slowly evacuated through emergency exits following the blasts – but were told to leave all their hand luggage as police checked bags for more explosives.

Evacuated air passengers were ferried onto buses and driven to a 'crisis centre' away from the airport. Women and children were moved first.

Pauline Deglume tweeted: 'My godfather is located at the airport and said he saw dismembered bodies everywhere.'

Dries Valaert, 30, was waiting to get his boarding pass from a check in desk when the blast struck.

He told MailOnline: 'There was a first blast and then ten seconds later a second explosion. It was a big big blast, the ceiling went down. It was just 30 metres from where I was.

'I saw people down on the ground and I just went running. I jumped over the security fences towards the departure gates as I thought it would be safer.

My first intuition was to get out in case their were attackers with guns. I saw a woman around 18 years old with a hole in her hand with blood pouring out and a man with an injured ankle and two people down. There was lots of panic. People were running all over the place.'

Mr Valaert, who was flying to a business meeting in Berlin, said he believed the bombs were hidden in suitcases that had just been checked in.

He said: 'The explosions were just behind the service desks, they were blown towards us. To me it is the most realistic possibility. I don't think it was someone with a suicide vest.'

Tribute: People stood in front of the Brandenburg gate in Berlin, which is illuminated in the colours of the Belgian flag this evening

In mourning: The Eiffel Tower in Paris illuminated in colours of the Belgian flag in tribute to the victims of terrorist attacks in Brussels

Je Suis Bruxelles: People hold up a banner as a mark of solidarity at the Place de la Bourse following the attacks in Brussels, Belgium

In honour and memory: Scores of people bring flowers and candles to mourn for the victims at Place de la Bourse in the centre of Brussels

Rest in peace: A young girl lights a candle at the Place de la Bourse following the attacks in Brussels, in which 31 people were killed

In loving memory: Candles are lit and dozens of touching notes left in honour of the 31 people who were killed in the Brussels attacks

Young and old: Mourners of all ages turned out to the Place de la Bourse in Brussels to pay tribute to those were tragically killed

Solidarity: Mourners lay candles at the Place de la Bourse in Brussels this evening following the terror attacks which have rocked the world

Armed police in protective clothing combed the building for more wounded travellers and suspicious bags. All flights are being diverted from the airport as it remains on lockdown.

Maelbeek is the station that most EU workers use daily.

The European Commission's vice-president Kristalina Georgieva said meetings were cancelled and urged people to 'stay home or inside buildings'.

The metro station is close to the commission's Berlaymont headquarters, the European Parliament and the European Council's Justus Lipsius building in the Belgian capital.

Ms Georgieva said on Twitter: 'Following situation in Brussels. EU institutions working together to ensure security of staff& premises.Please stay home or inside buildings.

'All EU institutions are at alert level ORANGE - all meetings on premises and outside cancelled, access only for staff with badges.'

Police and special forces are looking for known members of any terror cell who may be planning more attacks.

They will also round up anyone who may pose a threat to the public, or acting suspiciously, in an attempt to foil any more attacks.

Special forces are also patrolling the streets in case of more bombings or marauding gunmen used to kill 131 people in at least five Paris attacks in November 13 last year.

Britain and United States will already be playing a key role in trying to help the Belgian authorities work out who was behind the attacks.

Both MI5 and the CIA have stations in Brussels and its teams have 'unique expertise' that will help trace those behind the bombings.

The National Crime Agency, Britain's FBI, will also be in the city already because of the heightened terror threat.

Tech specialists will be scanning the phone numbers, email addresses, IP addresses, GPS records and forums known to be used by terrorists - and tracing links to Britain and America.

Anti-terror raids: A Belgian police officer is seen searching an apartment in the Schaerbeek area of Brussels this evening after the attacks

Out in force: Belgian police and security personnel are seen during a series of anti-terror raids in Schaerbeek, Brussels, this evening

Anti-terror police: Detectives found an ISIS flag, chemical products and another nail bomb at a house during a raid in Schaerbeek tonight

Tracking down the suspects: A police sharpshooter takes aim from a helicopter hovering over Brussels' rooftops following the attacks

Guarding the skies: A police helicopter hovers over Brussels following the deadly bomb attacks which killed 24 and injured around 200

Collecting evidence? Police search for evidence and empty a public bin near the Maelbeek metro station which was bombed yesterday

Combing the verge: Police detectives were out in force to gather evidence which could help find those behind yesterday's atrocities

On the ground: Police officers were seen gathering evidence and combing the grassy area near Maelbeek tube station this afternoon

WAS FUGITIVE PARIS 'BOMB MAKER' BEHIND THE BRUSSELS BLASTS? TERROR EXPERT CLAIMS USE OF 'MULTIPLE EXPLOSIVE DEVICES' BEARS ALL THE HALLMARKS OF THE ISIS CELL THAT TARGETED THE FRENCH CAPITAL The suspected bombmaker responsible for the Paris massacre was very likely behind the Brussels blasts, a top terror expert has claimed. Rafaello Pantucci, the Director of International Security Studies at the Royal United Services Institute, said the use of 'multiple, viable explosive devices' bore all the hallmarks of the co-ordinated bomb attacks that killed 130 in the French capital. It also indicated that possibly more than one experienced bombmaker was involved, he added. Najim Laachraoui, who is believed to have gone on the run after Paris logistics chief Salah Abdeslam's capture. Police issued this photograph of Najim Laachraoui, one of the suspects of the Paris terror attacks who has gone on the run He said: 'We don't know much about him at this point. This individual is being identified as a bomb maker but we have concerns whether that is 100 per cent true or if he's one of a number of bomb makers. 'This terrorist group in Brussels had multiple, viable explosive devices. It suggests they were dealing with someone with substantial experience. 'That could be the same person responsible for the bomb devices in the Paris attacks but it could be someone else, part of a larger cell. 'Given the location and the nature and the use of explosives and guns the thought process goes down the page of assuming it's linked to the organised network around Abdeslam. 'We can't be sure but it would be surprising if it wasn't the same group.' A friend of Abdelhamid Abaaoud, who masterminded the November 2015 Paris attacks, told police that the jihadi claimed he was among 90 'kamikaze' terrorists who smuggled themselves across the Mediterranean with migrants and refugees. Advertisement

Armed presence: A soldier with his face covered guards a road near the Maalbeek subway station as they try to stop any further attacks

Deployment: Scores of armed forces have flooded the streets of Brussels as suspects remain at large

Since the Paris attacks, Scotland Yard has had officers in the French capital as well as in Brussels when it emerged the attackers were based in the Belgian capital.

These British officers, and diplomats, will be helping with the investigation.

Armed police have been deployed to airports, train stations, ports and border crossings around the world in the immediate aftermath of the suspected suicide attacks in Brussels.

From New York to Moscow, security measures were stepped up at transport hubs across the globe with police and military personnel carrying out extra high-visibility patrols and additional checks.

The border between France and Belgium was closed, Eurostar services in and out of Brussels were suspended and airlines to and from other destinations were warning passengers of potential disruption as the effects of this morning's terror attacks were felt around the world.

Train and bus stations, ports and road checkpoints were also put on high alert, with armed police on the streets in major global cities including London and New York, sniffer dogs deployed and extensive border checks put in place.

London mayor Boris Johnson said there would be an increased security presence at transport hubs in the city, while the country's most senior counter-terrorism officer Mark Rowley said police forces across the UK had increased their presence at key locations as a precaution in the wake of the Brussels attacks.

And in the US, the NYPD said it would be increasing security measures at mass transit points, bridges and tunnels, and other landmarks following the attacks.

Police and soldiers carrying guns were also seen at airports in the Netherlands, Germany, and Italy, while in France - still shaken from the November attacks in Paris - officers remained on high alert.

Troops have also been deployed other key locations across Brussels as Belgium raised its security level to 'maximum' in the wake of the attacks.

The entire border between Belgium and France was placed on lock-down, and the Thalys train service - which travels between France, Belgium and the Netherlands - was halted in the wake of the explosions, the operator said.

Dutch military police were carrying out additional high-visibility patrols at Schiphol Airport in Amsterdam

Armed officers make their way through the Eurostar terminal at St Pancras station in London. There was an increased security presence at transport hubs across the city