In this image taken from video emergency personnel gather around a body on the southside of Westminster Bridge (ITN via AP)

At least two people are feared dead after a terror attack in the heart of London.

One woman has been confirmed killed and a number of others have been hurt – including some with “catastrophic” injuries – on Westminster Bridge, a junior doctor at St Thomas’ Hospital has said.

Another individual is also reportedly dead.

The driver is reported to have mowed down at least a dozen pedestrians as he drove a grey Hyundai car across Westminster Bridge and towards Parliament.

View photos The alleged assailant, who stabbed a police officer before being shot (PA) More

He then crashed it into railings before reportedly running through the gates and stabbing a police officer.

Police then fired at least three shots on the attacker with some reports stating he has been killed.

Eyewitnesses have described the alleged assailant as an “Asian guy” in his forties.

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Video footage showed victims laying motionless on the bridge after being struck.

The car ploughed into several pedestrians, according to initial reports, with other people fleeing in panic.

Police have said they are treating the incident as a terror attack.

Radoslaw Sikorski posted a video to Twitter purporting to show people lying injured in the road on Westminster Bridge.

A car on Westminster Bridge has just mowed down at least 5 people. pic.twitter.com/tdCR9I0NgJ — Radosław Sikorski (@sikorskiradek) March 22, 2017





Mr Sikorski, a senior fellow at Harvard Centre for European Studies, said he saw at least five people lying on the ground after being “mown down” by a car.

“I heard what I thought what I thought was just a collision and then I looked through the window of the taxi and someone down, obviously in great distress,” he told the BBC.

“Then I saw a second person down, and I started filming, then I saw three more people down, one of them bleeding profusely.”

Jayne Wilkinson, an eyewitness, said: “We were taking photos of Big Ben and we saw all the people running towards us, and then there was an Asian guy in about his 40s carrying a knife about seven or eight inches long.

“And then there were three shots fired, and then we crossed the road and looked over. The man was on the floor with blood.

“He had a lightweight jacket on, dark trousers and a shirt. He was running through those gates, towards Parliament, and the police were chasing him.”

View photos Police are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise. (Stefan Rousseau/PA via AP) More

The incident happened at around 2:40pm after a loud explosion was also heard in the vicinity.

A tweet from the Metropolitan Police read: “We were called at approx 2:40pm to reports of an incident at #Westminster Bridge. Being treated as a firearms incident – police on scene.”

Alex Wafer, 47, who was cycling nearby and saw the aftermath, said: “At the end of the embankment it appears as though there is an ambulance.

“It looks as if they are treating somebody.

“And just below, it looks like there may be another paramedic treating someone else.”

View photos Emergency services at the scene outside the Palace of Westminster (Stefan Rousseau/PA via AP). More

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