Six people have been killed in an attack in central London in which three attackers were shot dead by police.
A white van hit several pedestrians on London Bridge just after 10pm London time.
Three men then left the vehicle and stabbed a number of people in Borough Market, an area known for its restaurants and bars.
Armed officers confronted and shot three male suspects within eight minutes.
The suspects were wearing what looked like explosive vests but these were later established to be hoaxes.
It is currently believed there were only three attackers involved.
London Ambulance Service said at least 30 people have been taken to hospital.
The British Transport Police said one of its officers was seriously injured after being stabbed as he responded to the incident, but his condition was not said to be life‑threatening.
Prime Minister Theresa May described the incidents as "dreadful events" and will chair a meeting of the government's Cobra emergency committee later today.
She added that the terrible incident in London is being treated as a potential act of terrorism.
Whatever the United States can do to help out in London and the U. K., we will be there - WE ARE WITH YOU. GOD BLESS!
— Donald J. Trump (@realDonaldTrump) June 3, 2017
London Mayor Sadiq Khan called it "a deliberate and cowardly attack on innocent Londoners".
Eyewitnesses told BBC that they saw people getting out of the van after the attack on the bridge and running towards Borough Market.
Gunshots were later heard in the area while one social media user posted a photograph appearing to show one of the attackers lying on the ground outside a pub in the food market, with what seemed to be canisters strapped to his body.
London Bridge incidents were terrorist attacks: police https://t.co/DbkTokHdl2 via @nypost
— Monica Crowley (@MonicaCrowley) June 4, 2017
The attack comes almost two weeks after 22 people died in a suicide bombing at a concert in Manchester.
In March, five people died in London when a car was driven at pedestrians on Westminster Bridge and a police officer was stabbed outside Parliament.
Source: BBC