UK arrests three as footage of London Bridge attack appears online

LONDON, June 8 (Reuters) - British police investigating the deadly attacks on London Bridge on Saturday said they had arrested three more suspects, as footage of the moment officers shot the assailants dead appeared online.

Counter terrorism officers, backed up by armed colleagues, arrested two men on the street in Ilford, east London, late on Wednesday, while a third was arrested at a house nearby, police said in a statement.

Two of the men, aged 27 and 29, were held on suspicion of preparing acts of terrorism while the third was detained over suspected drugs offenses.

RELATED: A look at the London Bridge attack

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Police respond to report of incidents at London Bridge
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Police respond to report of incidents at London Bridge
People leave the area with their hands up after an incident near London Bridge in London, Britain June 4, 2017. REUTERS/Neil Hall TPX IMAGES OF THE DAY
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. REUTERS/Hannah McKay TPX IMAGES OF THE DAY
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
LONDON, ENGLAND - JUNE 03: Police officers ni the road near Borough on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London. (Photo by Carl Court/Getty Images)
LONDON, ENGLAND - JUNE 03: Counter-terrorism special forces are seen at London Bridge on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London. (Photo by Dan Kitwood/Getty Images)
People speak with a police officer after an incident near London Bridge in London, Britain June 4, 2017 REUTERS/Hannah Mckay
LONDON, ENGLAND - JUNE 3 : Police officers cordon off the area around London Bridge, central London, after reports of pedestrians being hit by a white van on London Bridge in London, United Kingdom on June 3, 2017. UK Police said Saturday they were responding to two incidents on London Bridge and Borough Market amid reports of a van mowing down pedestrians. (Photo by Isabel Infantes/Anadolu Agency/Getty Images)
People leave the area after an incident near London Bridge in London, Britain June 4, 2017 REUTERS/Neil Hall
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
Police attend to an incident near London Bridge in London, Britain, June 3, 2017. REUTERS/Hannah McKay
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
LONDON, ENGLAND - JUNE 03: Members of the public leave the area at London Bridge on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London. (Photo by Dan Kitwood/Getty Images)
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
LONDON, ENGLAND - JUNE 03: Police officers clear the area near Borough market at London Bridge on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London. (Photo by Dan Kitwood/Getty Images)
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
LONDON, ENGLAND - JUNE 03: Armed policeprep up in Borough on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London. (Photo by Carl Court/Getty Images)
Police officers get changed as they attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
People speak with a police officer after an incident near London Bridge in London, Britain June 4, 2017 REUTERS/Hannah Mckay
Women embrace after an incident near London Bridge in London, Britain June 4, 2017 REUTERS/Hannah Mckay
People react as police attend to an incident near London Bridge in London, Britain, June 4, 2017. REUTERS/Hannah McKay
A photograph taken on a mobile phone shows British police cars blocking the entrance to London Bridge, in central London on June 3, 2017, following an incident on the bridge. Police are dealing with a 'major incident' on London Bridge, Transport for London said on Saturday, after witnesses reported seeing a van mounting the pavement and hitting pedestrians. / AFP PHOTO / Daniel SORABJI (Photo credit should read DANIEL SORABJI/AFP/Getty Images)
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
People leave the area after an incident near London Bridge in London, Britain June 4, 2017 REUTERS/Neil Hall
Police attend to an incident near London Bridge in London, Britain, June 3, 2017. REUTERS/Hannah McKay
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
LONDON, ENGLAND - JUNE 3 : Police officers cordon off the area around London Bridge, central London, after reports of pedestrians being hit by a white van on London Bridge in London, United Kingdom on June 3, 2017. UK Police said Saturday they were responding to two incidents on London Bridge and Borough Market amid reports of a van mowing down pedestrians. (Photo by Isabel Infantes/Anadolu Agency/Getty Images)
LONDON, ENGLAND - JUNE 03: Counter-terrorism special forces are seen at London Bridge on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London. (Photo by Dan Kitwood/Getty Images)
LONDON, ENGLAND - JUNE 3 : Police officers cordon off the area around London Bridge, central London, after reports of pedestrians being hit by a white van on London Bridge in London, United Kingdom on June 3, 2017. UK Police said Saturday they were responding to two incidents on London Bridge and Borough Market amid reports of a van mowing down pedestrians. (Photo by Isabel Infantes/Anadolu Agency/Getty Images)
LONDON, ENGLAND - JUNE 3 : Police officers cordon off the area around London Bridge, central London, after reports of pedestrians being hit by a white van on London Bridge in London, United Kingdom on June 3, 2017. UK Police said Saturday they were responding to two incidents on London Bridge and Borough Market amid reports of a van mowing down pedestrians. (Photo by Isabel Infantes/Anadolu Agency/Getty Images)
LONDON, ENGLAND - JUNE 03: A police officer escorts members of the public to safety at London Bridge on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London. (Photo by Dan Kitwood/Getty Images)
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Eight people were killed and 50 injured after three Islamist militants drove into pedestrians on London Bridge late on Saturday, then attacked revelers in nearby bars and restaurants with knives.

Closed circuit TV footage, which appeared online and in British media, showed the attackers - Khuram Butt, Rachid Redouane and Youssef Zaghba - cornering a victim and starting to stab him before police are seen arriving and opening fire.

Police have previously said eight officers who rushed to scene fired about 50 rounds, killing the three attackers.

The Times newspaper also said it had obtained footage of the men laughing and joking five days before the attack as they met outside the Ummah Fitness Centre, a gym in east London where Butt trained.

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Earlier this week the gym put a note on its door which read: "While Mr Butt did occasionally train here at UFC gym we do not know him well nor did we see anything of concern."

Police and the security agencies are facing questions about whether they missed chances to thwart the attack.

Butt had appeared in a television documentary called "The Jihadis Next Door," as one of a group of men who unfurled an Islamic State flag in a park and who had connections with known radical preachers.

Zaghba, an Italian-Moroccan national, was identified as a possible militant threat after he was stopped at Bologna airport in 2016 as tried to reach Syria. He was not charged, but local police monitored him carefully and said they had tipped off Britain when he subsequently moved to London.

RELATED: Tributes to the victims of the London Bridge attack

19 PHOTOS
Tributes to the victims of the London Bridge attack
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Tributes to the victims of the London Bridge attack
A bunch of flowers with a message of sympathy is seen near Borough Market after an attack left 7 people dead and dozens injured in London, Britain, June 4, 2017. REUTERS/Peter Nicholls
A bunch of flowers is left near London Bridge after an attack left 7 people dead and dozens injured in London, Britain, June 4, 2017. REUTERS/Dylan Martinez
Participants of the Riviera Water Bike Challenge in support of the Princess Charlene of Monaco Foundation, observe a minute of silence in tribute to the victims of the London attack in Nice, France June 4, 2017. REUTERS/Eric Gaillard
LONDON, ENGLAND - JUNE 04: A woman holds a sign reading 'ISIS Will Lose. Love Will Win', following last night's London terror attack, on June 4, 2017 in London, England. Prime Minister Theresa May has left the election campaign trail to hold a meeting of the emergency response committee, Cobra, this morning following a terror attack in central London on Saturday night. 7 people were killed and at least 48 injured in terror attacks on London Bridge and Borough Market. Three attackers were shot dead by armed police. (Photo by Leon Neal/Getty Images)
The Brandenburg Gate is illuminated with the colours of the British flag to show solidarity with the victims of the recent attack in London, in Berlin, Germany June 4, 2017. REUTERS/Christian Mang TPX IMAGES OF THE DAY
LONDON, ENGLAND - JUNE 04: Posters reading 'ISIS Will Lose. Love Will Win', are seen on a map of the area, following last night's London terror attack, on June 4, 2017 in London, England. Prime Minister Theresa May has left the election campaign trail to hold a meeting of the emergency response committee, Cobra, this morning following a terror attack in central London on Saturday night. 7 people were killed and at least 48 injured in terror attacks on London Bridge and Borough Market. Three attackers were shot dead by armed police. (Photo by Leon Neal/Getty Images)
The aftermath of the London Bridge terror attack is seen in London on June 4, 2017. Police forensics officers work on London Bridge. Seven people have been killed in central London after three men drove a van into pedestrians on London Bridge, before launching a knife attack on people around Borough Market. Flowers have also been put near the bridge to commemorate the victims. (Photo by Alberto Pezzali/NurPhoto via Getty Images)
LONDON, ENGLAND - JUNE 04: A police officer looks at a floral tribute left by a man near the scene of last night's terrorist attack on June 4, 2017 in London, England. Police continue to cordon off an area after responding to terrorist attacks on London Bridge and Borough Market where 7 people were killed and at least 48 injured last night. Three attackers were shot dead by armed police. (Photo by Christopher Furlong/Getty Images)
LONDON, ENGLAND - JUNE 04: A woman speaks to a female police officer as she carries flowers to London Bridge, the scene of last night's terror attack on June 4, 2017 in London, England. Police continue to cordon off an area after responding to terrorist attacks on London Bridge and Borough Market where 7 people were killed and at least 48 injured last night. Three attackers were shot dead by armed police. (Photo by Dan Kitwood/Getty Images)
A minutes silence is observed for the victims of the London terror attack, before the ICC Champions Trophy, Group B match at Edgbaston, Birmingham.
MANCHESTER, ENGLAND - JUNE 04: The Manchester United '08 XI take part in a minute's silence in memory of the victims of the terror attacks in Manchester and London ahead of the Michael Carrick Testimonial match between Manchester United and Michael Carrick All-Stars at Old Trafford on June 4, 2017 in Manchester, England. (Photo by John Peters/Man Utd via Getty Images)
Women leave flowers near Borough Market after an attack left 7 people dead and dozens injured in London, Britain, June 4, 2017. REUTERS/Peter Nicholls
Flowers and messages lie behind police cordon tape near Borough Market after an attack left 7 people dead and dozens injured in London, Britain, June 4, 2017. REUTERS/Peter Nicholls
Floral tributes are laid near Borough Market in London following Saturday's terrorist attack.
A poster near Borough Market in London following Saturday's terrorist attack.
A woman lays a bouquet of flowers at a pedestrian crossing by Borough market in London on June 5, 2017. British police on Monday made several arrests in two dawn raids following the June 3 London attacks, claimed by the Islamic State group which left seven people dead. / AFP PHOTO / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
LONDON, ENGLAND - JUNE 05: A commuter looks at some of the floral tributes on London Bridge after it was reopened following the June 3rd terror attack on June 5, 2017 in London, England. Seven people were killed and at least 48 injured in terror attacks on London Bridge and Borough Market. Three attackers were shot dead by armed police. (Photo by Leon Neal/Getty Images)
A message reading 'Peace for London' sits on flowers left at the scene, following Saturday night's terror attack, in London, U.K., on Monday, June 5, 2017. Police are stepping up drills and security on the streets as the challenge facing them continues to shift.� Photographer: Chris Ratcliffe/Bloomberg via Getty Images
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The authorities have said Butt was known to police and the domestic security service MI5 but there was no intelligence that an attack was being planned. They said they were unaware of the other two men.

Police have made more than a dozen arrests in the wake of the London Bridge attacks, but most have now been released without charge.

In a separate investigation not linked to the London Bridge attacks, officers backed up by armed police arrested three men in east London on Thursday on suspicion of preparing for acts of terrorism. (Reporting by Michael Holden; Editing by Andrew Heavens)

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