Video shows police officers barging into a pub near London Bridge and shouting at customers to get down and hide under tables, as reports of possible acts of terrorism are happening around London.

It has been reported that five men mowed down up to 20 people with a white van on London Bridge before getting out of the vehicle near Borough Market and stabbing several people in bars and restaurants, including one man who was reportedly stabbed five times in the chest.

The video, posted to Twitter, shows a commotion as people walk back and forth inside the bar, believed to be Katzenjammers on Southwark Street, near where the attacks where happening.

Video shows police officers barging into a bar near London Bridge and shouting at customers to get down and hide under tables, as reports of possible acts of terrorism are happening around London

The video, posted to Twitter, shows a commotion as people walk back and forth inside the bar, believed to be Katzenjammers on Southwark Street, near London Bridge and Borough Market, where there were several stabbings

In the video, police can be heard shouting for people to get down and stay down as customers run and crouch underneath tables and benches in the bar. Officers continue to shout and walk around the bar

Police can be heard shouting for people to get down, and customers begin to crowd underneath tables and benches.

Officers are then seen, motioning for people to stay down as they continue shouting and walk around the bar.

The five men who drove the van onto London Bridge and randomly stabbed multiple people near Borough Market shouted 'this is for Allah'.

They have reportedly killed six people and left at least 48 more injured in their horrific rampage around the two locations in central London.

They had metal canisters strapped to their chests and three were reportedly shot dead by armed police.

A search is underway for the two other men.

50 armed police have entered Monument station with police dogs and bystanders have been told to run.

Bank and Monument tube stations have been closed. There are also unconfirmed reports of gunfire on Southwark Street.

A third attack in Vauxhall has been confirmed as an unrelated stabbing, which police have also responded to.

Police have shut down London Bridge because of the attack.

The five men who drove the van onto London Bridge and randomly stabbed multiple people near Borough Market shouted 'this is for Allah'. They have reportedly killed seven people and left dozens more injured in their horrific rampage around the two locations in central London

Katzenjammers, pictured, is beside Borough Market and near London Bridge, where the attack on the bridge and the random stabbings happened Saturday night