Two terror attacks have taken place in central London, according to the police.

The incidents in London Bridge and Borough Market are being treated as "terrorist incidents", according to Met Police.

A van is thought to have driven into people in London Bridge, where at least one fatality has been confirmed, and people have been reported stabbed in Borough Market. Authorities gave no further confirmation of what happened or why they were being referred to as terror incidents.

London Bridge Terror Attack Show all 16 1 /16 London Bridge Terror Attack London Bridge Terror Attack Armed police on Borough High Street as police are dealing with a "major incident" at London Bridge PA London Bridge Terror Attack Armed Police talk to members of the public outside London Bridge Hospital as police are dealing with a "major incident" at London Bridge PA London Bridge Terror Attack Police Officers outside the Barrowboy and Banker Public House on Borough High Street as police are dealing with a "major incident" at London Bridge PA London Bridge Terror Attack Armed Police talk to members of the public outside London Bridge Hospital as police are dealing with a "major incident" at London Bridge PA London Bridge Terror Attack Armed police on Borough High Street as police deal with a 'major incident' at London Bridge PA London Bridge Terror Attack Emergency services near the scene of the incident Screengrab London Bridge Terror Attack People run down Borough High Street as police are dealing with a "major incident" at London Bridge Reuters London Bridge Terror Attack Emergency services arrive at the scene near Borough market at London Bridge Carl Court/Getty Images London Bridge Terror Attack Emergency personnel on London Bridge as police are dealing with a "major incident" at London Bridge PA London Bridge Terror Attack Police sniffer dogs on London Bridge as police are dealing with a "major incident" at London Bridge PA London Bridge Terror Attack A second helicopter lands on London Bridge as police are responding to three incidents in the capital, amid reports that a vehicle collided with pedestrians on London Bridge, Scotland Yard said. Officers are dealing with reports of stabbings in Borough Market, where armed officers attended and shots were fired. They are also at an incident in the Vauxhall area PA London Bridge Terror Attack Police attend to an incident on London Bridge in London REUTERS London Bridge Terror Attack Police attend to an incident on London Bridge in London, Britain Reuters London Bridge Terror Attack A police officer escorts members of the public to safety at London Bridge Getty Images London Bridge Terror Attack Police attend to an incident on London Bridge in London, Britain Reuters London Bridge Terror Attack Police attend to an incident near London Bridge in London, Britain Reuters

The Metropolitan Police tweeted: "At 0025hrs 4/6/17 the incidents at London Bridge and BoroughMarket were declared as terrorist incidents."

A stabbing at Vauxhall was unrelated, the force added.

Prime Minister Theresa May said she was being updated by officials on the "fast-moving" situation, adding: "I can confirm that the terrible incident in London is being treated as a potential act of terrorism."

She will chair a meeting of the Government's Cobra emergency committee on Sunday, Number 10 said.

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 not yet known, he said.

He said trains were not stopping at London Bridge and Borough Market. Vauxhall station, which was temporarily closed, has now reopened.