This is the moment an armed police officer trains an assault rifle on the window of a suspect arrested in connection with the Westminster terror attack.

The officer, wearing a balaclava and helmet, is seen in the back garden of a suburban house during a raid in Birmingham yesterday.

The raid was one of a series carried out around the country by anti-terror police after Khalid Masood killed four and injured more than 50 in London on Wednesday.

Police trained their guns on a house in Birmingham yesterday in a raid thought to be linked to the Westminster terror attack

A total of 11 have been arrested as part of the inquiry but Scotland Yard said only four remain in custody - two men aged 27 and 58 who were arrested in Birmingham on Thursday and a 32-year-old woman and a 35-year-old man who were arrested in Manchester on Friday.

All are being held on suspicion of preparation of terrorist acts.

Six of those arrested have now been released from police custody and face no further action - two women aged 21 and 26 and four men aged 23, 26, 27 and 28 who were all arrested at addresses in Birmingham.

One of the arrested was Masood's partner Rohey Hydara, 39, who lives at a property in east London's Olympic park.

She has been released on bail until late March.

Neighbours say armed police were at the scene for more than an hour yesterday morning

Neighbours say a man who lives in the area was arrested and a BMW car seized

A neighbour who took the pictures of the armed officer during the raid in Birmingham said: 'I went to my window and there three cops with guns running up to the back window.

'There was shouting and screaming for ages, I couldn't hear what they were saying but it was proper loud. It sounded like there were loads of people in there.'

The neighbour added: 'They just stood there for like an hour or 45 minutes. I think they were making sure that no one was going to try and escape round the back or anything like that.

'I had no idea what the hell was going on and now people are saying it's something to do with the attack in London.'

A number of local residents said they believe a man from Saudi Arabia lived at the house in the Winson Green area with his wife and children.

Local resident Shekila Sahota, said a man, thought to be in his 40s or 50s, had lived at the address for about a year.

She added: 'The man they led away was put in the van straight away and he had a big smirk on his face when they took him away.'

The raid came ahead of the arrest of two more 'significant' suspects this morning as police try to find out whether terrorist killer Khalid Masood was aided by others.

Two people, a man and a woman, were arrested in Greater Manchester in the early hours of this morning and another man, aged 27, was arrested in Birmingham.

Police confirmed a 34-year-old man was arrested in a mews road in the affluent West Didsbury suburb of Manchester in the early hours of this morning.

Residents who live close to the affluent gated community, where properties are believed to sell for up to £500,000, said a car had been towed from the area.

The Met's top anti-terror officer Mark Rowley said police have searched 21 properties around the country, with five searches ongoing this morning, and seized 2,700 items including numerous computers.

Raids have been carried out across the country as police investigate Muslim convert Masood

Police are trying to work out whether Westminster terrorist Khalid Masood was aided in his murderous plot. They have now arrested 11 people, with one woman released on bail

Police outside a property which was raided in Winson Green, Birmingham yesterday

An arrest was also made in West Didsbury, Greater Manchester overnight following a raid

Masood, 52, killed 75-year-old Londoner Leslie Rhodes, US tourist Kurt Cochran, 54, and mother-of-two Aysha Frade, 43, as he ploughed into pedestrians on Westminster Bridge. He then stabbed PC Keith Palmer, 48, to death inside the grounds of Parliament.

THE 11 ARRESTS MADE SINCE THE ATTACK A 39-year-old woman was arrested at an address in east London. She has since been put on bail until late March. A 21-year-old woman and a 23-year-old man were arrested at an address in Birmingham but have been released without charge. A 26-year-old woman and three men aged 28, 27 and 26 years old were arrested at a separate address in Birmingham. Further, a 58-year-old man was arrested on Thursday morning at a separate address in Birmingham and remains in custody. Another 27-year-old man was arrested in Birmingham late on Thursday and remains in custody. Two more people, a 32-year-old woman and a 35-year-old man in Greater Manchester, were arrested early Friday morning. The woman has been bailed pending further inquiries. All of the arrests have been made on suspicion of preparation of terrorist acts. Searches were also carried out in Carmathanshire, Wales, and Brighton, Sussex. Advertisement

Scotland Yard have also urged anyone who knew Masood or has any information about him to come forward.

Asked about where the Muslim convert had been radicalised, Mr Rowley said: 'As I have said, our investigation focuses on understanding his motivation, preparation and associates.

'Whilst there is no evidence of further threats, you will understand our determination to find out if he either acted totally alone, inspired by terrorist propaganda; or, if others have encouraged, supported or directed him.

'To that end in our continuing investigation and ongoing covert activity we have made further significant arrests overnight - in the West Midlands and North West.'

Mr Rowley said officers had spoken to around 3,500 witnesses - including 1,000 who were on Westminster Bridge and around 2,500 who were in Parliament.

He added: 'We remain keen to hear from anyone who knew Khalid Masood well, understands who his associates were and can provide us with information about places he has recently visited.

'There might be people out there who did have concerns about Masood but did not feel comfortable for whatever reason in passing those concerns to us.'

Asked whether Masood had travelled overseas, Mr Rowley said 'we are looking at his history'.

Separately from the arrests in the Midlands and North West, police were last night searching a flat in east London which previously housed teams during the 2012 Olympic Games.

It is believed the property was home to a Rohey Hydara, who is believed to have lived with Masood in at least three separate addresses.

Last night, the Met said Masood's partner Hydara, 39, was released on bail pending further inquiries. She was arrested on suspicion of preparing terrorist acts.

Masood is also thought to have lived in London and there was a police presence outside Lucia Heights block of flats, in East London (close to the London Stadium) last night

This property in east London is one of 21 which have been searched by police this week

The flat is in the Olympic Village and previously housed athletes during the 2012 Games

Police have also raided the home of Masood's mother, Janet, in rural Wales. They remained at the scene today

Mrs Elms gave birth to him when she was a 17-year-old living in Dartford, Kent

The movements of Khalid Masood 1964 - Born Adrian Elms on Christmas Day in Dartford, Kent and takes the name Adrian Russell Ajao. 1966 - His mother, Janet Elms, marries in Crawley, West Sussex and they later move to Tunbridge Wells, Kent and Rye, East Sussex. 1983 - In November that year, he picks up his first conviction, for criminal damage. 2000 - Jailed for two years for grievous bodily harm. When he is released, he moves to the East Sussex village of Northiam. 2003 - Aged 39 and running an aerial installation firm, he is jailed for six months for possession of a knife in Eastbourne, East Sussex. 2004 - After being freed from prison, he marries Muslim Farzana Malik in Medway, Kent. It is unclear for how long they were married but they are now believed to be divorced. 2005 - Believed to have taught in Yanbu, Saudi Arabia. 2006 - Said to have lived in Crawley and to received visits from police. 2008-2009 - According to his CV, he returned to teach in Jeddah, Saudi Arabia. 2009-2012 - He is believed to have lived in Luton having changed his name to Khalid Masood. His CV claims he worked at a language school. 2012 - Set up his own teaching firm in Birmingham. Advertisement

Officers could be seen rifling through rooms on the first floor flat, although curtains in most of the windows were drawn.

Residents of the nine-storey block near to the Eurostar Stratford International Station said police had been in the building all day.

Neighbours said they saw Masood at the apartment several weeks ago.

Local resident Vera Amade, 21, said: 'My brother saw him a few times quite recently in the last few weeks.

'It was definitely him, the woman has two kids, one of the daughters has just had a baby. They all live in the same flat.

'She was quite polite, there was nothing bad to say about her. He was really nice and polite as well, he was very pleasant.

'I'm very shocked. We were watching it on TV last night and trying to figure out if it was definitely him and it is.

'He was always dressed in a suit, I don't know what he did for a living. He used to come back from work at about five or six.'

Masood was registered to two addresses in Luton in 2010 and 2011 and was recorded as living in Forest Gate, east London, last year.

Hydara was also registered as having lived at those three places.

A neighbour said three children lived in the home in Forest Gate with their mother, aged between eight and 15.

He said they later moved out to the Olympic Village.

The man, who did not want to give his name, said: 'There was a family who lived here and then they moved out.

'They were there about five, six years. I only saw the kids and the mother.

'We saw the family there, we saw the ladies there but I never saw a man living there. I think he was clean shaven when I did see him last year.

'He was darker, seemed a bit plump. But he was cleanly shaven. I occasionally saw him, I just assumed he was working all day.'

A number of addresses in Birmingham have been searched, including a flat above a takeaway

A police van remained outside a flat above a takeaway, in Hagley Road, Birmingham yesterday

A neighbour in London, who asked not to be named, told the Press Association: 'This guy is a local guy. I've been living in the area for 20 years.

'I don't know him personally but I believe he belongs to a mosque on Leyton High Road.

'I've seen his face many times. I saw him on the news at around 7pm last night and thought 'this is the guy I know from the mosque.'

Terror hotline number Anyone with any information about Masood can call the Anti-Terrorist Hotline 0800 789 321. Advertisement

'He had a beard and big eyes.'

Worshippers at the Al-Tawhid mosque in Leyton were surprised to learn of Masood's alleged links with the mosque.

One, Abdul Abdul, told the Telegraph: 'We condemn this attack. A true Muslim would never do this. He's not one of us, he's not a representative of us'.

Masood, 52, who was born as Adrian Elms in Kent, is believed to have most recently lived in the West Midlands.

Police yesterday searched a three-storey townhouse in the Winson Green area of Birmingham and neighbours said Masood had been seen there last year.

At the time of the attack, Masood is thought to have returned to Birmingham and is believed to have stayed in a dingy bedsit above a shop in the Edgbaston area.

A photo taken in Birmingham on Wednesday night appears to show one of the three suspects arrested at the scene sitting in the back of a police van in Hagley Road

Armed police stormed a flat on Hagley Road, Birmingham on Wednesday night as part of a series of raids across the country following the Westminster attack.

Masood rented the Hyundai from Enterprise car hire on Spring Hill passage in Birmingham

Iwona Romek, speaking in Winson Green, Birmingham said she could not believe it when she realised the man who had lived near her was the same person responsible for the attack.

She said: 'I am very surprised, I cannot believe it. Because when I saw him, I couldn't even see that he could do something like this.

'Now I'm scared that someone like that was living close to me.'

She added: 'I see pictures of him lying injured and from that picture I can see it's him.

'And my partner as well he has seen the picture, he is at work, and when I showed it him he said 'oh my God' it's him.'

Ms Romek said she had seen him with a child, aged between five and six years old, and a partner but that they had moved away around two to three months ago.

One of the other properties raided was a flat in this building in the Winson Green area of Birmingham, where neighbours claimed Masood lived with a woman and a young child

It is thought he also stayed at a flat above a restaurant in the Birmingham's Hagley Road, which was raided on Wednesday night.

Stunned residents described seeing more than a dozen black-clad officers equipped with machine guns smashing their way into the Birmingham flat, believed to be a rental, at about 11pm on Wednesday.

One witness who works in a shop near the second-floor Birmingham flat said: 'The man from London lived here.'

He added: 'They came and arrested three men.'

Another resident said he recalled two men living there.

He heard one man in the flat speaking on the phone in what he described as an 'Arabic or Pakistani accent', saying he had heard it 'for the last two or three nights'.

A neighbour says he believes the man who carried out the attack in London yesterday lives in the flat above the takeaway

The flat in Hagley Road is one of six properties raided around the country, with armed officers storming the flat before detectives moved in

Stuart Bailey, who lives four doors down, was going for a drink with his friend when an armed officer shouted for him to 'go left'.

The 25-year-old added: 'There were a load of armed police in the street and on the pavement and I could see three or four in front of me.

'They were all dressed in black and armed with what looked like MP5s (submachine guns) and one of them had six ammunition magazines strapped to his leg.

'I wasn't allowed back in my property for an hour.'

A shopkeeper said police had told customers and staff to stay inside the store while the operation continued.

Hagley Road was sealed off by officers for several hours as the raid was carried out.

The road is in the well-heeled district of Edgbaston - a cricket-loving corner of Britain's second largest city that is unused to the sight of armed police blocking off streets.

Dozens of officers, some with weapons, were seen swooping an address near to the Bearwood area of the city last night

A police officer is seen at the scene on Hagley Road in Birmingham. Police are on high alert after the terror attack in London on Wednesday which claimed the lives of three victims

Lucas Camoes, a 23-year-old warehouse worker, said: 'It's a very calm area. There are loads of university students here so it's very surprising this happened right here.

'I don't feel safe at all. A bit paranoid.'

Car rental firm Enterprise confirmed the Hyundai 4x4 used in the attack was rented in Spring Hill, Birmingham, less than a mile from the house being searched.

In a statement, the car hire company said one of its employees had identified the vehicle after seeing the licence plate in an image online and the firm had immediately contacted the authorities.

The firm said in a statement: 'We are co-operating fully with the authorities and will provide any assistance that we can to the investigation.

'Our thoughts are very much with the victims of this terrible tragedy.'

Masood was not currently being investigated by authorities and there was 'no prior intelligence about his intent to mount a terrorist attack', Scotland Yard said yesterday.

These pictures are understood to show the inside of the flat which was raided by police before it was let out

Neighbours said lots of people moved in and out of the building and the area and were uncertain over who lived there

He was known to police and has a range of previous convictions for assaults, including GBH, possession of offensive weapons and public order offences dating back to 1983 - but none for terrorism offences.

Four people died in London after terrorist Khalid Masood, driving a Hyundai 4x4, crashed into pedestrians on Westminster Bridge before hurtling towards the gates of Parliament.

Masood also died after being shot by armed police.

More than 50 people, from at least 12 nationalities were injured in the attack, with 17 still being treated in hospital, where two remain in a critical condition, with one person's injuries considered life-threatening.

REVEALED: 'Lone wolf' terror attacker Khalid Masood was on WhatsApp TWO minutes before unleashing carnage in London... so who was he communicating with?

'Lone wolf' terror attacker Khalid Masood was on WhatsApp two minutes before unleashing carnage in London, MailOnline can exclusively reveal.

Questions are now being raised over whether the jihadist was working with a network when he brutally murdered four innocent people and injured at least 50 during the horrific attack on Westminster on Wednesday.

Masood was on Whatsapp at 2.37pm - approximately two minutes before ploughing into people on Westminster Bridge and four minutes before he was shot dead by armed officers outside Parliament.

Pictured: A screen-grab of Khalid Masood's WhatsApp profile taken on Thursday by MailOnline shows the attacker was active in the app on his iPhone moments before he ploughed into innocent people on Westminster Bridge

Masood had never been convicted of terror offences, although Theresa May revealed he was on MI5's radar a number of years ago.

Police insist there was no intelligence suggesting he was about to unleash a terror attack.

The policeman who shot the attacker on the parliamentary estate is believed to have been a close protection officer for Defence Secretary Michael Fallon rather than a member of the gate team.

Masood was a married father-of-three and a religious convert who was into bodybuilding, according to Sky News.

Theresa May revealed MI5 knew of the attacker but considered him a 'peripheral' figure who was 'not part of the current intelligence picture'

A Scotland Yard spokesman said yesterday: 'Masood was also known by a number of aliases. He was not the subject of any current investigations and there was no prior intelligence about his intent to mount a terrorist attack.

'However, he was known to police and has a range of previous convictions for assaults, including GBH, possession of offensive weapons and public order offences.

'His first conviction was in November 1983 for criminal damage and his last conviction was in December 2003 for possession of a knife. He has not been convicted for any terrorism offences.'

ISIS claimed responsibility for its first attack on British soil and said the crazed knifeman was its 'soldier'.

Life of Westminster terrorist Khalid Masood's mother who sews cushions from her rural Welsh farm she shares with chickens and a border collie

The mother of Westminster terrorist Khalid Masood lives in a farm in rural west Wales with a bordie collie and chickens where she runs an online business selling hand-made bags and cushions.

Former Boots worker Janet Ajao, 69, is known by villagers as a 'respectable grey-haired lady' running her own business from her farmhouse in Trelech, Carmarthenshire.

Mrs Ajao gave birth to Masood as a 17-year-old single mother in Dartford, Kent, on Christmas Day in 1964.

Pictured: A police officer stands on guard near the house of Janet Ajao in Trelech, where she is currently being given support by a family liaison officer

Just under two years later the young mother, known then as Janet Elms, married Phillip Ajao and had two more sons, Paul and Alex. Masood grew up in a £300,000 house in the seaside town of Rye, East Sussex.

Paul Ajao, 50, lives in Banbury, Oxfordshire, and runs a number of florists and fabrics companies.

He denied knowing Masood, while MailOnline have so far been unable to get in contact with Alex, 40, an account director.

Mrs Ajao and her 77-year-old husband Philip - who is believed to be of Nigerian background - live a peaceful existence in the small village, which has a population of just 745 people.

Police were still at their house on a quiet lane of five isolated homes today but Ms Ajao was 'too upset' to talk - and she was being given 'appropriate support' by a family liaison officer.

Officers said the search of their house has been 'concluded' and said they had not seen her this morning.

Police officers on guard near the home of Khalid Masood's mother in the village of Trelech, Carmarthenshire, Wales

Pictured: Officers near the home of Masood's mother, Janet Elms, who gave birth to him when she was a 17-year-old living in Dartford, Kent

Police said she told them she did not want them at the address and 'just wants to be left alone.'

The mother-of-three was spotted looking outside her window and opening her door while police were concluding their investigation.

She ordered police to turn people away from the farm property surrounded by fields and a public footpath.

A neighbour said: 'They are very nice quiet people - I believe Phil is in hospital at the moment. It must be very, very difficult for her.

'Whatever has happened, she has lost a son.

'They've been here for years. We say hello when we see them walking the dog.

'I know they have sons but I can't recall ever seeing them visit since they moved her.

'It was a real shock when police turned up because nothing like this ever happens here. It is a very quiet place.'

His mother now lives with her husband in Carmarthenshire, west Wales, where she runs an online business selling hand-made bags and cushions (pictured)

Dairy farmer Mark Sillars, 59, sold the couple their three-bedroom home, called Lleiniau, almost 20 years ago.

He said: 'They were typical of people who moved here - friendly, neighbourly, they wouldn't interfere with your business, and you wouldn't with theirs.

'They liked the isolation. I don't know why, but for whatever reason they wanted to live in the middle of nowhere.

'Janet is a lovely lady. She kept sheep which she sold at the local market as organic meat, she used to work in Boots in Carmarthen and a Little Chef. Then she started making handbags and cushions.

'Phillip worked in a cheese factory. He was keen on astronomy and kept a lot of telescopes. I think that's part of the reason they wanted to be so rural, because of the clear skies.

'They liked the place when I showed them round, and they bought it straight away.

'I was aware they had children who would periodically visit but I didn't know who they were. You'd know they were there because there would be three or four more cars in the drive.

'They used to come up at Christmas and on the odd weekend. People in the village are speculating that Khalid visited last week, but that might just be rumours.'

Masood's mother makes 'original hand-crafted bags and other textile goodies' in rural Wales

Another neighbour said: 'It is a very quiet place but we see the couple occasionally. It must be a terrible shock.

'As far as we can see, Janet has done nothing wrong and this must be hell for her. She just leads a quiet life here like all of us.'

On the website Folksy, Mrs Ajao sells her handmade items.

In the description on the site, she says: 'Hello, I'm Janet and I live in rural west Wales with my husband, border collie and a few chickens.

'Our home is tucked away at the end of a little lane, and it's here that you'll find me making bags and cushions.

'I use natural fabrics, both new and recycled, and love to make use of old Welsh wool blankets.

'All items are one-off. You may see the same style of bag, or the same fabric may reappear in a different guise, but never the same thing twice.'

Mr Ajao, a former cheese factory worker and Masood's father, is a keen photographer and astronomer who enjoys listening to classical music. He is currently being treated in hospital with a serious illness.

He enjoys classical music, especially Vivaldi, and has a keen interest in photography and astronomy.

It is understood he is currently away from home being treated in nearby Glangwili General Hospital.