A white van has reportedly ploughed into 20 people in a suspected 'terror attack' on London Bridge station.
There are unconfirmed reports that least seven people have been stabbed as witnesses told of bodies 'strewn' on the road at the landmark in central London.
One witness said she saw three people with what appeared to be their throats cut on London Bridge.
Others said they saw three men jump out of the van, suspected to be a B&Q vehicle, and began 'randomly stabbing people' along Borough High Street with 12-inch long knives.
Terrifying footage from the scene shows police officers shooting 'Clear the scene now!' as panicked pedestrians flee.
The bridge is in lock down and the area around it is closed with bus routes being diverted, as armed police and a bomb squad attend the scene and boats search the water.
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A white van has reportedly ploughed into 20 people in a suspected 'terror attack' on London Bridge station, amid unconfirmed reports of gunfire and stabbing
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London Bridge station has been evacuated amid reports of the suspected terror attack
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Armed police are said to be at the scene while people have been seen fleeing the 'horrific scene' at the landmark in central London
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London Bridge is being evacuated after 'terror attack' fears
A cab driver told LBC that three men jumped out of the van.
He said: 'They just had these long blades, about 12 inches long. They just went randomly along Borough High Street stabbing people.
'A young girl got stabbed in the chest, she was laying there - it's so sad.
'I thought, 'I'm gonna try and hit him, I'm gonna try and knock him down'. I spun the cab round, I was about to ram one of them, but he side-stepped and three police officers came running towards them with their batons drawn.
'I was shouting at everybody, just get away from the area, stay back, just run the other way. There were a good few hundred people out there.'
'He's veered across the road towards the right hand of where Southwark Cathedral is and rammed it where the steps are.
'He just rammed it towards them, wedged it in between the lamppost and the steps and so he's hit people there.
'They've jumped out of the van and started stabbing people randomly. There was a scattering of people.'
'Clear the area now!' Police attend incident at London Bridge
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The bridge was seen to be on lockdown. London Bridge and the area around it has been closed due to a 'major police incident', TFL said
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Witnesses told the BBC that a white van veered off the road on London Bridge and hit five or six people
Police tape surrounds London Bridge as it stays on lockdown
London Bridge and the area around it has been closed due to a 'major police incident', TFL said.
London Bridge station has been closed and no trains are expected until the end of service.
Holly, who said she was just two metres away from being hit by a white van, described the chaos on London Bridge after the attack.
She told Radio 5Live: I was probably two metres away. I saw it hit the people in front of me. I feel just so lucky now.
‘It was all a blur, but as much as I can remember it was a male on their own [driving the van]. There are five people on the floor being attended too. There are loads of city police officers helping and boats on the Thames searching.’
Witnesses told the BBC that a white van veered off the road on London Bridge and hit five or six people.
One witness wrote on Twitter: 'Passerby says 15-20 people have been run over. Another says 7 or 8.'
'Horrific scene at London Bridge. Bodies strewn over the pavement, B&Q van mounted the pavement. I feel sick,' one witness wrote.
'On a boat travelling under London Bridge. Buses stopped. Police lights everywhere and boats checking the water. Please let everyone be okay!' another added.
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People were seen running away in panic amid reports of stabbing and gunfire
Armed police are attending the 'horrific' scene alongside ambulances
Video shows area around London Bridge amid reports of shots fired
Police are dealing with a major incident and all routes are being diverted.'
The Metropolitan Police posted on Twitter: 'We are dealing with an incident on London Bridge, when we have more information we will update this twitter feed.'
London Bridge is closed both ways due to a police incident, Tfl said, warning the public to avoid the area.
Scotland Yard said officers were at the scene and they would update with further information.
London Ambulance said multiple resources were attending the area.
