A man has been shot and killed by officers on London Bridge.
A person is believed to have started attacking people with a knife and was then shot dead by armed police.
Mark White said: “An attacker, we believe armed with a knife, started attacking people and that armed police were deployed. We believe that the alleged attacker has now been fatally shot.”
Video from the bridge appears to show one armed police officer at the beginning of the northside of the bridge crouched behind a police car aiming a gun down the bridge.
The video then moves to what appears to be a body on the pavement on the east side of the bridge.
Offices around the bridge are on lockdown and London Bridge station is closed, while trains are not stopping, British Transport Police said.
Joe, who is currently being held in his office, told Sky News: “We saw loads of police cars heading towards the bridge. We saw a man on the ground and police pointing guns at him.”