Spokesman: May being briefed on bridge incident

Several people have been injured with one feared dead as gunfire was also heard in the area, police said.

One witness told Reuters that she saw what appeared to be three people with knife wounds and possibly their throats cut. A short time later, police received reports of stabbings in the nearby Borough Market. And police say that there have been stabbing incidents there and that they've sent in armed officers to address that. Authorities are also responding to a third incident in the Vauxhall area. The patrons sheltered in the basement and police then arrived at the scene, the witness said.

British Prime Minister Theresa May says an incident involving a vehicle and reported stabbings in London "is being treated as a potential act of terrorism".

Transport for London said busy London Bridge station was closed at the request of police.

The Metropolitan Police said they were called just after 10 p.m. (2100GMT) to reports of a vehicle hitting pedestrians on the bridge, which crosses the River Thames in central London.

BBC reporter Holly Jones was at the bridge when the van came through and reported the van veered off the road and into crowds of people.

"Within my line of sight, there were five or six people on the ground that were not moving", he said. "All Americans stand in solidarity with the people of the United Kingdom", she said.

A large number of police officers were seen gearing up with helmets and riot gear, believed to be on the hunt for suspects.

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Several pedestrians were run over by a van in London on Saturday, according to multiple eyewitness reports.

"As I was getting away from the area, I saw police with guns running towards the south end of the bridge".

LANGFITT: Absolutely, and I think that coming - three incidents like this, you know, there was a long stretch where London did not face big sort of terrorist attacks. He said he threw chairs, glasses and bottles at the attackers in a bid to stop them.

Medics treated people lying injured on the ground near the market as shocked people cried and shouted around them.

Witnesses who were enjoying nights out in pubs and bars in the area were warned to barricade themselves indoors, while people on the streets surrounding London Bridge began to run for their lives. "We are using all necessary skills and resources", police said. Witnesses also reported seeing people being stabbed by at least one man.

Britain's terror threat was recently lowered from "critical", which had been put in place after a bombing killed 22 people at an Ariana Grande concert last month in Manchester.

A charity concert for victims of the Manchester attack, featuring Grande and other stars, is due to be held in the northwest English city on Sunday.

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