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Terrified diners have described fighting off a terrorist knifeman who stormed a London restaurant leaving victims drenched in blood .

It came as an armed thug with a foot-long blade went on the rampage in busy Borough Market in central London.

At around the same time a van ploughed into pedestrians on London Bridge, leaving several dead.

Terrified customers in Borough Market armed themselves with chairs and glasses to fight off the assailants in an incident described by Prime Minister Theresa May as an "potential act of terror".

One witness told the Sun Online: "There were people throwing chairs and glasses outside and I thought it might just be a fight. Then I realised it was more than that, people were running.

(Image: Sky News) (Image: MAGIC MOMENTS UK)

(Image: Twitter/indykaila)

“Next thing we know, they’re in our restaurant. People were screaming ‘they’ve got knives’.”

Photos show victims in bloodied clothing.

The Met Police said: "Officers have then responded to reports of stabbings in #BoroughMarket. Armed officers responded and shots have been fired."

There is currently confusion over the exact names of the establishment or establishments affected in London Bridge, and a huge cordon remains in place.

Meanwhile, a vehicle mounted the pavement at the scene in London Bridge this evening, according to shocked witnesses.

(Image: Twitter/indykaila)

(Image: PA)

Police have confirmed more than one person has been killed in the suspected terror attack.

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

(Image: London News Pictures Ltd)

Metropolitan Police said: "From 2208hrs officers responded to reports of a vehicle in collision with pedestrians on London Bridge.

"Officers have then responded to reports of stabbings in Borough Market. Armed officers responded and shots have been fired.

(Image: PA)

Another witness said gunfire was heard.

A voice in a Facebook live video believed to be a police officer as authorities cleared the area can be heard saying: "Please leave the area. It's not something to be recorded. People have died."

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