London Bridge incident: Reports of gunshots as police detain stabbing suspect - latest news

London Bridge has been sealed off after several people were injured in a stabbing amid reports of gunshots in central London.

Eyewitnesses said they saw what they believed to be a fight between several men trying to restrain another man.

Armed police are then understood to have responded, firing shots.

On Friday afternoon, Scotland Yard said: "Police were called at 1.58pm to a stabbing at premises near to London Bridge.

"Emergency services attended, including officers from the Met.

"A man has been detained by police. We believe a number of people have been injured."

Videos on social media purport to show a man lying on the pavement on the bridge as armed police officers can be seen pointing guns at him.

Police have evacuated also London Bridge station and the surrounding area including offices and restaurants.

A cordon has been set up at Borough Market while evacuation continues from nearby shops and businesses.

3:01PM

Helicopter hovers above London Bridge

This footage shot from a building overlooking London Bridge shows a helicopter hovering above the River Thames.

Down on street level, the chaos is clear.

Traffic is seen at a standstill.

2:59PM

Police yelling 'get inside' on London Bridge

As sirens and alarms blare out, officers can be seen sprinting outside London Bridge Tube station.

They can be heard yelling "get inside".

2:58PM

Video from Borough Market

2:54PM

London Ambulance declare major incident

London Ambulance Service said it had declared a major incident.

A statement on Twitter said: "We have now declared a major incident and have a number of crews at the scene in London Bridge. We will share more information as soon as we have it."

2:50PM

Picture shows armed police advancing on London Bridge

A still from a video posted online shows armed police advancing on London Bridge.

The video was shot from inside a bus.

2:47PM

Man detained after 'a number of people injured' in stabbing

Here's the official line from Scotland Yard:

2:45PM

What we know so far

1. Police dealing with an incident on London Bridge

2. London Bridge station evacuated

3. London Ambulance Service in attendance

4. Eyewitnesses have reported gunshots

2:44PM

Journalist's account of London Bridge incident

BBC correspondent John McManus told BBC News that he had heard several gun shots on London Bridge.

"Just a few minutes ago I was walking across London Bridge on the south bank to the north bank of the bridge," he said.

"There appeared to be a fight going on on the other side of the bridge, with several men attacking one man."

"Police then quickly arrived, including armed police, and then a number of shots were fired at this man," Mr McManus told BBC News.

"Police have now cleared the bridge, everybody has been told to move back and now on the northern side of the bridge, but there are more shots going on.

"I can't see what's happening now because we've been moved out of the way but there are shots going on, and you probably hear the police sounds as well.

"Everybody has cleared the area, the entire bridge has been moved, and right on the northern part of the bridge, right up until quite near the Bank of England, is being cleared."