Breaking News: Terrorists strike again in London leaving several dead

At least six people have been killed and more than 30 people were also wounded in the UK capital after a van ploughed into pedestrians on London Bridge and attackers went on stabbing spree in the nearby Borough Market area, a busy area with many restaurants and pubs, before being shot dead by police late on Saturday.

"Armed response officers then responded very quickly and bravely and confronted the three male suspects who were shot and killed on Borough Market," Mark Rowley, Britain's top anti-terrorism officer, said.

"Sadly, six people have died in addition to the three attackers shot by police," he added.

The attackers were wearing what appeared to be suicide vests, but police later said they were later established to be fake.

Witnesses saw "a white van ram into pedestrians hitting several people before coming to a halt".

"Another witness said three men got out with long blades and randomly started stabbing people along Borough High Street. Other witnesses have also mentioned seeing knife victims," he said.

Police said in a statement that officers "responded to reports of a vehicle in collision with pedestrians on London Bridge" and then "to reports of stabbings in Borough Market".

"Armed officers responded and shots have been fired," the statement said.

Police ruled a third incident - a stabbing in London's Vauxhall area initially thought to be linked to the other two scenes - to be unrelated.

One of the men suspected of being involved in the attack was shown in a photograph lying on the ground with canisters strapped to his body after he was shot by the police.

The possible attacker was shown on the ground outside the Wheatsheaf pub in Borough Market near London Bridge.

Another man was seen lying on the ground a short distance away in the photograph.

London Mayor Sadiq Khan described the incidents as a "deliberate and cowardly attack on innocent Londoners".

"Paramedics had [those injured] on their sides, it was a bloody scene," she said.

"Some were injured about 50 meters behind the van, some were injured about 10 metres from where the van stopped."

Prime Minister Theresa May's office said she was "in contact with officials and is being regularly updated on the incident at London Bridge".

May's office said she would chair a meeting of the government's COBRA emergency committee on Sunday.