Two victims were killed, three others were injured, and a suspect was shot dead by police in a terrorist incident on London Bridge on Friday afternoon.
Police said that the suspect was wearing a "hoax" explosive device and they were keeping an "open mind" about the motive.
They said that officers from the City of London Police shot the man, who died at the scene. The police said they were responding to a stabbing and that "a number of people have been stabbed."
Multiple videos online seem to show a man held down by other people before being shot by police.
Both Prime Minister Boris Johnson and London Mayor Sadiq Khan praised the "breathtaking heroism of members of the public who literally ran towards danger."
Two victims were killed, three were injured, and a suspect was shot dead by police in a terrorist incident on London Bridge on Friday afternoon, London Metropolitan Police said.
Neil Basu, assistant commissioner with the Met Police, said that officers and emergency services responded to reports of a stabbing at about 2 p.m. near London Bridge.
He said that one man was shot by specialist officers from the City of London police and died at the scene. He said the man was wearing a "hoax" explosive vest and he could "confirm that it has been declared a terrorist incident."
"I must stress we retain an open mind as to any motive," he said. "It would be inappropriate to speculate further at this time." Police had said earlier on Twitter that "a number of people have been stabbed." Basu did not give an update as to their condition, but said that information would be shared later.
"We are now in a position to confirm the identity of the suspect as 28-year-old Usman Khan (10.03.1991), who had been residing in the Staffordshire area," Basu confirmed in an early morning update. "As a result, officers are, tonight, carrying out searches at an address in Staffordshire.
"This individual was known to authorities, having been convicted in 2012 for terrorism offences," Basu continued. "He was released from prison in December 2018 on licence and clearly, a key line of enquiry now is to establish how he came to carry out this attack."
Basu also said that they are not actively looking for anyone else connected with the attack.
Armed police and officers with sniffer dogs just raced down canon street towards the station away from London Bridge. On the north side here several roads are closed @LBCpic.twitter.com/q4C5L7XyHE
"Tragically, two people – a man and a woman – were killed during the attack," Basu said in his Saturday morning update on the attack. "Three others – a man and two women – were also injured and remain in hospital."
Britain's prime minister and London's mayor praised the civilians who 'literally ran towards danger'
Videos on social media appeared to show members of the public pinning down the man before he was shot. London Mayor Sadiq Khan praised the "breathtaking heroism of members of the public who literally ran towards danger."
In one video, a man can be seen backing away from the group holding a knife, apparently trying to move it further away from the suspect.
Video shows man walking away with a knife from incident at London Bridge. BBC correspondent Andy Moore says it's presumed he took the knife off the suspect https://t.co/6GvyKd0jiTpic.twitter.com/ERS10Dsxel
Sky News reported that the man was a transportation police officer in plainclothes.
In other videos, an officer can be seen stepping back from the struggle and apparently shooting the man at close range while he lies on the ground. Business Insider is not publishing the videos because of their graphic nature.
Prime Minister Boris Johnson told reporters he had been briefed on the incident, and expressed gratitude for the bravery of the police officers and civilians who "physically intervened to protect the lives of others."
"To me, they represent the very best of our country, and I thank them on behalf of all of our country," Johnson said. "This country will never be cowed or divided or intimidated by this sort of attack, and our values — our British values — will prevail."
Johnson said he had halted his campaign for the evening after the attack.
Witnesses described scenes of chaos, while authorities urged restraint in sharing photos and videos
"The circumstances, as we currently understand them, are that the attacker attended an event earlier on Friday afternoon at Fishmonger's Hall called 'Learning Together,'" Basu said in a statement. "We believe that the attack began inside before he left the building and proceeded onto London Bridge, where he was detained and subsequently confronted and shot by armed officers."
People who were at the scene told The Guardian that they panicked and sought cover in nearby restaurants or shops, while others said they were trapped in these buildings or in their places of work as the bridge remained locked down.
Police said that people should continue to avoid the area and asked for people to come forward with any information and any pictures or videos they captured. Police also said they were increasing patrols across London and the rest of the UK. Other videos showed another man wielding a knife.
The Metropolitan Police tweeted: "Please use common sense and restraint in circulating pictures and videos of the #LondonBridge incident. Help us keep you safe."
BuzzFeed UK reporter Mark Di Stefano also said that the nearby Borough Market was being searched by armed police that are "clearing out each bar one by one." He added: "People being told by police to get as far away from area as possible."
Yahoo News also reported that an eyewitness said the attack appears to be linked to an earlier incident in a building called Fishmongers' Hall, where people were apparently stabbed. Many social-media users shared footage of the incident from the bridge, which has a number of office buildings looking over it.
This footage shows panicked people clearing the bridge.
Police shouting for everyone to move away. Real panic setting in at London Bridge. Rumors of a shooting? pic.twitter.com/vBZoKu73za
Tim Shipman, a politics editor at the UK's The Sunday Times, shared an image of police vehicles on the bridge, and with other vehicles facing the wrong way.
Something big going down on London Bridge pic.twitter.com/tPIUe7OyDP
London Bridge station, which has both the London Underground subway services and train services, was closed immediately after the attack but reopened around 6:30 p.m., according to Britain's National Rail network.
This footage shows the scene outside the station:
#londonbridge is locked down and the station evacuated. Chaos outside the station. Does anyone know what's going on? pic.twitter.com/c5dYp83DcB
Khan said the Metropolitan Police "confirmed that as a precaution the horrendous incident at London Bridge is being treated as though it is terrorism-related."
He added: "I remain in close contact with the Metropolitan Police and am being kept updated with events. It has been confirmed that people were injured in the attack. My heart goes out to them, their families, and all affected."
He also said: "We must — and we will — stay resolute in our determination to stand strong and united in the face of terror. Those who seek to attack us and divide us will never succeed."
Labour leader Jeremy Corbyn said there were "shocking reports from London Bridge."
"My thoughts are with those caught up in the incident. Thank you to the police and emergency services who are responding."
This is a developing story. Check back for updates.