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.
All those arrested in connection with the Westminster attack have now been released by police.
Tony Davis was the first civilian to reach Pc Palmer after he was stabbed during the Westminster attack.
Defiant Londoners put on a show of solidarity for the victims of the Westminster terror attack at a vigil in their honour.