Police have confirmed that attacks at London Bridge and Borough Market are “terrorist incidents”, following reports of a vehicle ploughing into pedestrians on a bridge and stabbings.
Scotland Yard have confirmed a stabbing in Vauxhall is not connected.
Police were called at around 10.08pm to reports of a vehicle hitting pedestrians on London Bridge.
Officers then attended a second incident at nearby Borough Market after reports of stabbings. Armed officers responded and shots were fired.
Prime Minister Theresa May said: “This is a fast moving investigation. I want to express my huge gratitude to the police and emergency services who are on the scene. Our thoughts are with those who are caught up in these dreadful events.”
The Prime Minister will chair a meeting of the Government’s Cobra emergency committee on Sunday, No 10 said.
British Transport Police said there were reports of “multiple” casualties following the major incident on London Bridge.
Witnesses described seeing a speeding vehicle veer into crowds on the bridge, while video showed dozens of people with their hands on their heads escorted away from the scene by officers.
And in the popular food market in south London, witnesses said they saw a man with a large blade.
Nick Brandon of the BTP’s force control room said he had received reports of an incident possibly involving a knife and a vehicle.
The seriousness of the injuries were not yet known, he said.
Witnesses have described seeing a speeding vehicle veer into crowds on London Bridge and people being stabbed in Borough Market.
Husband and wife Ben and Natalie told BBC Radio 5 Live they were outside Borough Market, coming up the entrance of the underground when they saw the incident.
Ben said: “We saw people running away and then I saw a man in red with a large blade, at a guess 10 inches long, stabbing a man, about three times.
“It looked like the man had been trying to intervene, but there wasn’t much he could do. He was being stabbed quite coldly and he slumped to the ground.”
Ben said the man walked away boldly with another person, and went towards the Southwark Tavern. He said they saw a metal chair being thrown towards the man.
“Then we heard three gunshots, definitely gunshots, and we ran.”
Jamie, a witness who was in a restaurant on Rochester Walk near London Bridge, told the Press Association: “We were in the Black and Blue restaurant, we heard a fight and everyone got up and everyone rushed out of the restaurant and we heard a massive, massive bang.
“Then we hid under the table and people came into the restaurant and knocked a bunch of stuff over, like the till.
“And then we ran into the restaurant into the kitchen, where there was a bunch of other people and a guy had been stabbed and he was cut and he was bleeding quite a lot.”
He added that they waited in the kitchen for “quite a while” before they were evacuated.
Holly Jones, a BBC reporter at the bridge when the incident happened, said a van had swerved off the road into a crowd of pedestrians.
“A white van driver came speeding - probably about 50mph - veered off the road into the crowds of people who were walking along the pavement,” she told BBC News.
“He swerved right round me and then hit about five or six people. He hit about two people in front of me and then three behind.
“I’d say there are about four severely injured people. They all have paramedics assisting them at the moment.”
Ms Jones said police were on the scene within two minutes, quickly followed by ambulances.
Police boats were searching the river - apparently looking for people who may have been thrown off the bridge, she said.
She said that among the injured was a French woman who told her she did not know where the two people who had been with her were.
“She told me in French, ‘I don’t know where those two other people are’. So the police are checking the Thames,” Ms Jones said.
“They were right near the edge of the bridge. It looks potentially they could have been thrown over.”