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A dramatic video has emerged of police officers telling terrified pubgoers to get down as they storm into a boozer following the London Bridge suspected terror attack tonight.

Cops can be seen rushing into the bar appearing to shout for people to take cover and 'stay down' following reports that a white van ploughed into pedestrians injuring up to 20.

In the footage, posted to Twitter, revellers desperately hide behind tables and chairs as officers continue to warn them to stay put.

Sounds of glasses being smashed can be heard as people shaken from the incident become disorientated.

There are unconfirmed witness reports from the scene at London Bridge tonight that people may have been stabbed and as many as four people were severely hurt.

(Image: Twitter/indykaila)

Metropolitan Police have confirmed there is also another incident at nearby Borough Market and armed police are at both scenes.

A witness told Reuters she saw people with apparent knife wounds on the bridge.

The news agency said a witness had said she saw three people with what appeared to be throats cut.

(Image: Twitter/indykaila) (Image: Twitter/indykaila)

Sky News has quoted sources said the incident at London Bridge is believed to be terrorism related.

Another witness told Sky News gunfire was heard.

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 of the road into the crowds of people who were walking along the pavement," she told BBC News.

(Image: PA)

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."

A Downing Street spokesman said: "The Prime Minister is in contact with officials and is being regularly updated on the incident at London Bridge."

It comes just two months after a terrorist mowed down pedestrians at Westminster Bridge before stabbing an unarmed cop.

Five victims were killed in the attack.