UK police name two London attackers, say one previously known to them

LONDON (Reuters) - One of the three attackers who killed seven people near London Bridge on Saturday night was previously investigated by British security services but had not been viewed as a serious threat, British police said on Monday.

Khuram Shazad Butt, aged 27, was a British citizen born in Pakistan, who was already known to police and Britain's domestic spy agency MI5, London's police force said.

"However, there was no intelligence to suggest that this attack was being planned and the investigation had been prioritized accordingly," police said in a statement.

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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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The second attacker was named as 30-year-old Rachid Redouane, who police said claimed to be Moroccan and Libyan, and also went by the name Rachid Elkhdar with a different date of birth. Both men lived in the same area of east London.

Police said they were still working to establish the identity of the third attacker. Late on Saturday the three attackers drove south across London Bridge, mowing down pedestrians before stabbing bystanders in the nearby Borough Market area.

British police are stretched by the number of people they believe could potentially commit an act of terrorism. There are 500 current investigations involving 3,000 potential suspects.

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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)
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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
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Floral tributes are laid near Borough Market in London following Saturday's terrorist attack.
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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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"A small number of the highest priority investigations involve current attack planning, and these investigations command a significant proportion of our resource," police said.

Prime Minister Theresa May came under pressure from the media and the opposition Labour Party on Monday over cuts to police funding during the years when she was interior minister.

Saturday's attacks - which in addition to the seven dead left dozens in need of hospital treatment, including 18 in a critical condition - came less than a week before Britons vote in a national election.

"Our work necessarily involves making difficult judgments about how to prioritize the resources available to us at a time when the UK is facing a severe and high tempo terrorist threat," police said.

(Reporting by Andy Bruce, writing by David Milliken; editing by Guy Faulconbridge and Kylie MacLellan)

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