This is the incredible moment a hotel worker chased the Tunisian gunman moments after he slaughtered 38 innocent tourists including 18 Britons.

The unnamed man, who filmed the end of the massacre on his phone, can be seen running after Seifeddine Rezgui as the ISIS militant selects his targets.

At one point he even picks up what appears to be a bottle of olive oil as he attempts to sneak up behind the 23-year-old assassin to disarm him.

This is the incredible moment a hotel worker chased the Tunisian gunman (circled) moments after he slaughtered 38 innocent tourists

The 11-minute video was released as it emerged the number of Britons killed in Sousse on Friday could reach 30.

It also came as Tunisia made its first arrests in connection with the terror attack.

Speaking at lunchtime, the country's Interior Minister Najem Gharsalli said: 'We have started by arresting a first group, a significant number of people, from the network that was behind this terrorist criminal.'

He added that officials were still verifying whether Rezgui had been trained in Libya in jihadist camps

The footage begins in the grounds of a tourist hotel, part way through the crazed gunman's 25-minute rampage.

The worker is one of a large group, which includes tourists still in their swimwear, trying to make sense of what is happening as shots can be heard in the background.

As he zigzags through empty sunbeds and attempts to hide behind a bush, a large explosion goes off nearby, thought to be from a grenade.

Remarkably, the group continues to follow Rezgui as he makes his way closer to the hotel lobby.

At the beginning of the video, the worker is one of a large group, which includes tourists still in their swimwear, as shots can be heard in the background

The unnamed worker zigzags past empty sunbeds and tables as he attempts to hide behind a bush

Rezgui pictured before the attack. Officials said while he did not have a criminal record, he was known to authorities for ‘low level radicalism’ and was once stopped by police for smoking cannabis

As they get near to him, the video shows the attacker holding his gun in the air as he walks past empty restaurant tables.

In an incredible show of bravery, the cameraman can be seen taking what appears to be a bottle of olive oil off a table as he begins to follow Rezgui just metres behind him.

But, as he edges closer, the gunman turns round and points his assault rifle directly at him.

In an incredible show of bravery, the cameraman can be seen taking a bottle of olive oil off a table as he begins to follow Rezgui

As other citizens start arriving at the hotel, they spot the killer - who is still armed - on the beach and run after him.

The devastating effect of the attack is clear, as innocent victims lay dead near the sunbeds they had been enjoying just minutes before.

The clip ends as police officers can be seen shooting Rezgui, who was discovered praying in a side street.

The release of the footage comes as a retired police officer told how a second gunman in red shorts is also believed to have opened fire on the north African beach.

Steve Johnson, who witnessed the attack first hand, described how he saw a man in red shorts shooting tourists with an automatic rifle along with the gunman in dark clothing.

The account suggests that the gunman was not a 'lone wolf' as current reports state.

Mr Johnson said: 'We saw what we believe was a second terrorist. It was a guy in red shorts, walking down from the hotel into the pool area. He just had red shorts on, nothing else on his legs or his feet or his body.

'And he had an automatic rifle in his arms and people were just running from him.

'We know that he wasn't the original terrorist, the one in black, because my colleague had actually seen that man, who he initially thought was a policeman but he saw him shooting down people on the beach.

'So it was all pretty horrific. We stayed there until all the firing had stopped and the whole place was surrounded by police officers, military and helicopters.'

Later on, after seeing that television reports were describing a 'suspect', Mr Johnson spoke of how he alerted police officers in reception to tell them about the second gunman.

The clip shows the devastation on the beach, as innocent victims lay dead near the sunbeds they had been enjoying just minutes before

Belongings can be seen scattered across the sand in the footage, as the brave worker continues to follow the killer

It ends as the worker stumbles across police officers shooting Rezgui, who was discovered praying in a side street

They confirmed that a man of his description had also been killed.

Mr Johnson, from Leicester, said: 'We said there were definitely two people.

'He showed us his mobile phone and he said, "Is this the man we saw?" and he showed us the man in black and it was his body. We said, "No, it was a man with red shorts on" and he said: "He is dead as well".'

Speaking on BBC's Radio 4 this morning, the Tunisian Ambassador to the UK confirmed he believed Rezgui may have had 'one or two persons or three persons that helped him'.

Nabil Ammar also said armed police were being deployed to all Tunisian beaches, as the country warned it could not rule out further attacks.

'We will see all the beaches protected by armed policemen,' he told BBC Radio 4's Today programme.

He said he expected it to have 'negatives' for the tourism industry, which is a 'vital, crucial, very important sector for our economy'.

Mr Ammar added: 'If we are wise we shouldn't say that nothing will happen in the future. Maybe not on the beach but we don't know exactly.

Home Secretary Theresa May landed in Sousse to visit the scene of the attack on Monday morning

She joined ministers from France, Germany, Belgium and Tunisia and laid flowers on the sand

The officials bow their heads for a moment of silence as they remember the 38 victims who were slaughtered

A young girl wearing a dress with the Tunisian flag on lays flowers at the scene as armed security looks on

A man walks past the sunbeds, which are still taped off, with bunches of flowers in his hands

Two armed guards ride a black quad bike as they patrol the beach during the memorial service

Tourists pay their respects in front of a makeshift memorial at the beach near the Imperial Marhaba resort before the Home Secretary's arrival

'But, of course, all the measures now are taken in order to avoid [that]. This can happen in every part of the world, nobody is safe from that.

'This is a drama for us, this is a drama for the families, for your country, for my country as well.

'This will only strengthen our bilateral relationship because the British blood mixed with the Tunisian blood in Tunisia is reminding me of the Second World War where your brave soldiers were together with ours in order to liberate our country from Nazi forces.

'You are a great people and we are a great people. This will only reinforce our bilateral ties. Our blood is now mixed for a second time.'

He made the comments as the Home Secretary landed in Sousse to visit the scene of the attack.

Theresa May joined French Interior Minister Bernard Cazeneuve, German Interior Minister Thomas de Maiziere and Belgian Interior Minister Jan Jambon as they laid flowers and observed a period of silence during the first official visit at the scene.

Beauty blogger Carly Lovett (left) was killed alongside Lorna Carty (right), a mother-of-two in her 50s

Adrian Evans (second left), Charles Evans (second right) and Joel Richards (far right) were also killed. Youngest brother Owen (left) survived the attack

The first Welsh victim was today named as Trudy Jones (pictured left), a 52-year-old carer. Stuart Cullen (right), of Lowestoft, Suffolk, was also killed. His wife survived the terror attack and has been flown home

Mrs May and foreign office minister Tobias Ellwood have travelled to the country to pay their respects and take part in talks with the Tunisian government on addressing the extremist threat.

Speaking after the memorial, she said: 'What happened here last Friday was a despicable act of cruelty. How could a place of such beauty, of relaxation and happiness but turned into such a scene of brutality and destruction.

'Sadly we know that at least 18 British tourists died in this terrorist attack but we also know that that number will rise.

'I've heard of the horror stories of people who went through this and our thoughts are with the victims and their families.

'But I've also heard stories of great bravery as well. The young man who shielded his fiancee from the bullets, the staff at the hotel who protected their guests.

'I would like to thank the Tunisian authorities, the Tunisian government and the staff here at the hotel for all they have done to help and support the victims of this despicable act.

'We are absolutely clear as Prime Minister David Cameron has made clear this morning that we are resolved... to defeat those who would do us harm, to defeat those who would undermine our freedom and democracy, and to ensure the terrorists do not win.'

Meanwhile, Mr Cameron spent Monday morning at an emergency Cobra meeting.

Suzanne Davey, 44 (left), has been confirmed as dead by her son Conor Fulford, 23 (right), who paid tribute to her on Twitter, writing 'Love you always Mom, I've got my teddy bear you got me tonight'

Ms Davey's partner Scott Chalkley, 42, has also been confirmed as dead by his son Ross Naylor, who broke the news on social media, writing 'rest in peace dad'

Bruce Wilkinson, pictured with his wife Rita, is understood to have died in the massacre

Scottish couple Ann and Jim McQuire (pictured together) were killed by the ISIS fanatic

Lisa Burbidge (left) and Claire Windass (right) were among the 18 Britons who are confirmed to have died on the beach in Tunisia

Speaking this afternoon, he announced a national moment of silence to be held in honour of British tourists at noon on Friday. A memorial will be planned for the victims in the future.

He also urged Tunisia to speed up the identification process and demanded officials give British experts access to bodies and evidence.

He added that he would be contacting the families of British victims, of which 15 have been named so far.

Those who were killed include James and Ann McQuire, who were sunbathing side by side at the time of the attack, grandmother Trudy Jones, 51, of Blackwood, South Wales, and internet beauty blogger Carly Lovett.

Owen Richards, a 16-year-old who was injured in the attack, lost three members of his family - his uncle Adrian Evans, 49, his brother Joel, 19, and their grandfather Charles Patrick Evans, 78.

Suzanne Davy, 44, and her partner Scott Chalkley, 42, were also killed along with Trudy Jones, a 52-year-old carer, and former Drax power station worker Bruce Wilkinson, 72.

Claire Windass, 52, Stephen Mellor, 59, Stuart Cullen, 52, and Lisa Burbidge, thought to be in her 60s, were also confirmed dead over the weekend.

The first of the British victims injured in Tunisia arrived back in the UK yesterday.

Mathew James was shot in the chest and hip after using his body as a human shield to protect his fiancee Saera Wilson from the sudden onslaught of bullets.

A man pays his respects to British victims Patrick Evans, Adrian Evans and Joel Richards at Walsall FC's Banks's Stadium in Walsall

The 30-year-old, from Pontypridd, Wales, was flown back early on Sunday morning on a stretcher and was transferred immediately to hospital.

Others are being flown via private carriers, while the four Brits with the most serious injuries are being transferred by the RAF. It is thought they will arrive back in the next 24 hours.

Thousands of terrified tourists were also flown home from the country in one of the biggest airlifts ever organised by British tour companies.

Wave after wave of empty aircraft were dispatched from the UK in response to pleas by British visitors traumatised by the beach massacre and desperate to return home to worried loved ones.

Departure lounges became so crowded that hundreds of people had to wait outside for their flights to safety.