London Bridge across the River Thames in the centre of the British capital was shut down on Friday after several people were injured and a man was held following a stabbing.
According to AFP, the Metropolitan Police said it was called at 1:58 pm (1358 GMT) to a stabbing at premises near the bridge, which in June 2017 was hit by a terror attack which killed eight.
“A man has been detained. We believe a number of people have been injured,” police added.
Prime Minister Boris Johnson said: “I’m being kept updated on the incident at London Bridge and want to thank the police and all emergency services for their immediate response.”
Interior minister Priti Patel said she was “very concerned” at events.
A BBC reporter on the bridge at the time said he saw what appeared to be a fight between a group of men, heard two shots and saw a man “prone” on the ground.
The incident happened on the north side of the bridge. People in the area were quickly ushered away from the scene, images on social media indicated.
London Bridge station, on the south side of the bridge, was evacuated, the British Transport Police said, while a cordon was set up at Borough Market.