At least two people have been killed, police have said, following what appears to be a terrorist attack at London Bridge.
Police are responding to a second incident in Borough Market, and a third incident in Vauxhall – where a man has been arrested.
The SAS has been deployed to central London.
How did it start?
At 10.08pm police responded to a call about a white van ramming into five or six people on London Bridge.
Eyewitnesses spoke of there being two or three masked men, who got out of the van and started attacking people with knives.
A second incident is believed to have taken place at the Borough Bistro, in Borough Market. Eyewitnesses have told of seeing a man being stabbed by someone wearing a red hoody. The attacker then walked calmly away, and gunshots were heard near the Brindisi tapas restaurant.
The BBC is reporting that a security guard who works across multiple bars and pubs in Borough Market claims to have seen a man with a canister strapped to his abdomen. Stressing that the reports were unverified, the news channel claims the man saw the attackers after receiving a call from a colleague in another bar who said people had been stabbed.
The eyewitness described people running away screaming from three men, one wearing a red and black top. He claimed one man had a canister taped to his abdomen. The man and his colleagues tried to throw chairs at the three attackers, who were going in and out of different bars, before helping to evacuate the area.
Drinkers inside a pub have told of the police rushing in, and telling everyone to get on the ground. They were then told to run away from the area.
Police are responding to a third incident in Vauxhall. It is not clear if the Vauxhall incident is connected.