WITNESSES have described scenes of chaos and confusion as London police responded to yesterday's terror attack in the city.

Armed police opened fire during the attacks at London Bridge and Borough Market, in the heart of the capital's business district.

Witnesses described a van speeding into pedestrians on London Bridge and then a knife-wielding man sprinting towards a bar packed with revellers enjoying a Saturday night out.

Witnesses also said they saw two men stabbing people outside the popular Roast restaurant in Borough Market, according to The Guardian.

A chef from the nearby Fish restaurant said: "I saw two guys with big knives downstairs outside Roast. They were stabbing people. The police were running away, they were community police. They were normal officers, they were running away.

"The guy with the knife was killing two people. We were shouting 'stop, stop' and people threw chairs at them. Police came and shot straight away."

Gerard Vowls, 47, was at the start of the south side of London Bridge when he saw a woman being stabbed by three men, he told The Guardian.

"I want to know if this girl is still alive," he said. "I've been walking around for an hour and a half crying my eyes out. I don't know what to do."

Vowls said he had thrown chairs, glasses and bottles at the attackers in a bid to stop them.

"They kept coming to try to stab me ... they were stabbing everyone. Evil, evil people."

Alex Shellum was in the nearby Mudlark pub with his girlfriend when an injured woman came in seeking assistance.

"She was bleeding heavily from the neck - it appeared that her throat had been cut," he told the BBC.

"People sought to stem the bleeding and the pub was closed."