Over a dozen police vehicles have been deployed to London Bridge on Saturday night following reports of a van veering of the road, and hitting between five and six people.
Witnesses describe a white van mounting the pavement and hitting a number of pedestrians.
Police and ambulance services arrived within minutes of the incident.
There are reports police boats have been deployed to the river.
This incident appears similar to the attack on Westminster Bridge on March 22nd by Khalid Masood.
After 11 p.m. a separate incident was reported around Borough Market.
Borough and London Bridge tube stations have been closed in response.
Metropolitan Police confirmed this incident at 23:16.
The areas were closed off by police within an hour, with no trains going through London Bridge station.
At around 23:51, the first fatality, from the London Bridge, has been announced.
The news comes under a fortnight after the bombing of an Ariana Grande concert in Manchester, which claimed the lives of twenty-two people.
An increased police and military presence on the streets of major cities in the UK followed, including the Champions League final, which took place in Cardiff on the evening of the 3rd of June.
In the days after the Manchester attack, the terror threat level was raised to its highest level, critical. It was later lowered to severe.
Police worked to move people away from the areas affected in London past midnight. The Prime Minister, Theresa May, made her way to Downing Street.
#Breaking “Terrible” incident in London being treated as “potential act of terrorism”, PM Theresa May says
— Press Association (@PA) June 3, 2017
A meeting of the COBRA committee has been scheduled for the morning of June the 4th.
At 00:20, the BBC screened mobile footage from a bar in the area affected.
Multiple expletives were heard in the background of the footage.
Police services asked witnesses not to upload, while e services across the capital urged the public to only dial 999 in a genuine emergency.
— Metropolitan Police (@metpoliceuk) June 3, 2017
Met Police published a ‘Run, Hide, Tell’ poster following the incidents; information thought to be given out in the event of an attack not confined to one area.
Reports of shootings were still unconfirmed at 00:34, though it’s thought that the shots were from armed police responding at London Bridge and Borough Market.
Victims of the attack were taken to a hotel near Liverpool Street station, and armed police searched trains at Bank station, which was also closed.
At least twenty “walking wounded” were treated at a triage in the Liverpool Street hotel.
Bank: the station is now entry only. Customers are unable to exit at this station.
— Central line (@centralline) June 4, 2017
Media began reporting before 1am that the incidents in London Bridge and Borough Market were declared as acts of terrorism, but one reported in Vauxhall was not thought to be connected to the others.
Three men, according to witnesses, were in the van on London Bridge, and then exited the vehicle and headed, armed with knives, to Borough Market.
Facebook started a ‘Safety Check’ tool following the news.
The feature was first used for a terror attack during the events at the Bataclan in Paris in 2015.
Our thoughts are with #London.
— Sergio Ramos (@SergioRamos) June 4, 2017
Real Madrid captain, Sergio Ramos, responds to the attack from Cardiff
Following eyewitness reports, pictures emerged of two men lying on the ground near London Bridge after being shot by police.
One of the men appeared to have canisters containing an unknown substance wrapped around his body.
At 01:47, there was still only one confirmed fatality from any of the three incidents. The death toll has since increased to seven.