A police officer who was stabbed at the Houses of Parliament has died, sources told the Press Association.
It is the second death in Wednesday's attack, after a female pedestrian who was mowed down on Westminster bridge also died.
The attacker, armed with two large knives, mowed down pedestrians with his car on Westminster Bridge, including schoolchildren, then rushed at the gates in front of the Houses of Parliament, stabbing a policeman before he was shot by armed officers.
Police have appealed to the public for photos and video of Wednesday's attack in Westminster.
At least one person has died after a knifeman mowed down pedestrians, before stabbing a policeman. The attacker was then shot by armed officers.
Anyone with images or footage of the incident and the immediate aftermath can upload them here.
Former Prime Minister David Cameron has tweeted the following:
My thoughts with the families of those injured & killed. Those seeking to attack our democracy with these barbarous methods will never win.
Forensics officers are examining the grey Hyundai i40 used to knock down pedestrians on Westminster Bridge on Wednesday afternoon in what Scotland Yard is calling a "terrorist incident".
One woman died on the bridge and several others have suffered "catastrophic" injuries - in what Scotland Yard is calling a "terrorist incident".
A junior doctor has described the catastrophic injuries of a man hurt in the Westminster attack.
Colleen Anderson treated the patient at St Thomas's hospital for an array of injuries, while she also saw "at least nine" other victims brought onto wards.
She also confirmed one fatality.
Doctor Anderson said the man she treated had fractures to his leg, a dislocated shoulder, internal injuries as well as a laceration to the head.
She added that she and colleagues had been left "shocked" by the situation.
At least two people have died after a knifeman brought terror to the heart of Westminster.Read the full story ›
Pictures of today's events unfolding following a major security incident at the Houses of Parliament.Read the full story ›
Foreign Office Minister Tobias Ellwood was photographed with a bloodied face after giving emergency first aid to one of the people injured in the Westminster terror attack.
The former army officer gave mouth-to-mouth resuscitation to someone within the grounds of Parliament.
The MP for Bournemouth East was pictured amid the carnage in New Palace Yard, and his colleague Maria Miller said he "has given mouth-to-mouth resuscitation to one victim".
It is not the first time Mr Ellwood's life has been touched by an atrocity - his brother Jonathan was killed in the 2002 Bali bombing.
Three French students were injured during the attack at Westminster, according to the country's Prime Minister.
Bernard Cazeneuve said that a trio of upper school students were hurt in the supposed terrorist attack in London on Wednesday afternoon.
The Cobra committee brings together government ministers with senior officials of the emergency services and security agencies.Read the full story ›