Here's what we know so far about how events unfolded on Saturday night:

• Metropolitan police say they began to receive reports that a vehicle had struck pedestrians on London Bridge at 22:08 BST

• The vehicle - a white van - continued to drive from London Bridge to Borough Market

• The suspects then left the car and a number of people were stabbed, including a police officer

• Three male suspects were shot dead by police within eight minutes of the initial call about the incident

• The suspects were wearing hoax explosive vests. The suspects' identities have not been revealed

• Six people were killed in the attack, and at least 30 were taken to hospital

• No group has so far claimed responsibility for the attack

Image source, EPA

After the attack, police have been redirecting members of the public trying to get home

Image source, EPA

Image source, AFP

London Ambulance says the number of people taken to hospital has risen from 20 to more than 30.

Metropolitan Police say that "the suspects had been confronted and shot by the police within eight minutes of the first call" which was received at 22:08 BST.

And here's the full statement by Metropolitan Police, external detailing how the events unfolded on Saturday night.

Metropolitan Police also say that "the suspects were wearing what looked like explosive vests but these were later established to be hoaxes".

British Transport Police say that one of its officers "was seriously injured as he responded" to the incident.

Police have announced that six people have been killed and 20 injured in the attack.

Police also said that three male suspects were shot dead.

The US state department issues a statement, condemning "the cowardly attacks targeting innocent civilians in London".

It said the US "stands ready to provide any assistance authorities in the United Kingdom may request".

In a statement,, external Harun Khan, Secretary General of the Muslim Council of Britain, says: "I am appalled and angered by the terrorist attacks at London Bridge and Borough Market, in my home city. These acts of violence were truly shocking and I condemn them in the strongest terms.

"Muslims everywhere are outraged and disgusted at these cowards who once again have destroyed the lives of our fellow Britons. That this should happen in this month of Ramadan, when many Muslims were praying and fasting only goes to show that these people respect neither life nor faith.

"My prayers are with the victims and all those affected. I commend the work of our emergency services working hard to keep us safe and cope with the ensuing carnage."

This is the third terror attack in the UK since March.

On 22 May, 22 people were killed and 116 injured in a suicide bombing at Manchester Arena.

The attacker, identified as 22-year-old Salman Abedi, detonated a home-made bomb in the arena's foyer as crowds were leaving a performance by US singer Ariana Grande late in the evening.

On 22 March, six people died, including the attacker, and at least 50 people were injured in an attack near the Houses of Parliament.

Attacker Khalid Masood first drove his car at pedestrians on the pavement on Westminster Bridge before crashing into a perimeter fence. Masood, armed with a knife, then left the vehicle and ran towards Parliament, where he was shot dead by police.

BBC News Channel

Image source, Reuters

BBC correspondent Tom Symonds outlines how events unfolded on Saturday night, saying witnesses described seeing a van crashing into pedestrians on the southern side of London Bridge.

Eyewitnesses said three people - armed with knives - were seen jumping out of the van and they began attacking.

Mr Symonds said a police shooting followed the attack but it was not clear who was shot, nor how many.

Some eyewitnesses claimed they saw one attacker dead or not moving, and another on the ground who may have been alive.

The alleged attackers ran round the corner from where the van hit the people on the bridge to Borough Market, he said.

Explosions were heard coming from the bridge, Mr Symonds says. He suspects it was a controlled explosion but nothing has been confirmed by police.

From being at the scene, Mr Symonds said he did not think the incident was continuing. Police are relaxed, there's a helicopter at the scene but it does look like it's over, he says.

Gabriele Sciotto, who took the photo of a man lying on the ground with what appeared to be canisters strapped to his body, says they didn't look real.

The French embassy in Britain has tweeted a message from President Emmanuel Macron:

Following the attack at London Bridge and in Borough Market, London Ambulance Service says that at least 20 people have been taken to six hospitals across the capital.

The service says it has treated a number of people at the scene for "less serious injuries".

"We have declared a major incident and continue to work closely with other members of the emergency services," it said, in a statement.

A picture has now emerged of what appears to be the vehicle used in the attack.

A white Hertz van is seen crashed into what looks like railings.

Image source, H. Attai