LONDON - A person who was on London Bridge after an incident on Saturday told a Reuters reporter that she saw three people who appeared to have their throats cut.
The London ambulance service said it was responding to the incident.
Reuters was unable to immediately verify the statement by the witness.
British armed police rushed to three incidents in central London on Saturday after a van ploughed into pedestrians on London Bridge and reports of multiple stabbings in the nearby Borough Market area.
Police sent out security advice to Londoners on Twitter saying "run, hide, tell" if they were caught in an attack. The BBC cited police as saying there had been more than one fatality.
The attacks come days ahead of a June 8 election and less than two weeks after a suicide bomber killed 22 people at a pop concert by U.S. singer Ariana Grande in Manchester in northern England. There was no immediate claim of responsibility for the attacks.
"A van came from London Bridge itself, went between the traffic light system and rammed it towards the steps," a taxi driver told the BBC. "It knocked loads of people down.
"Then three men got out with long blades, 12 inches long and went randomly along Borough High Street stabbing people at random."
Prime Minister Theresa May had been informed and was being kept updated, her office said, while U.S. President Donald Trump had also been briefed by his national security team, the White House said.
© 2022 Thomson/Reuters. All rights reserved.