- Man shot by police as he tries to access Palace of Westminster
- Attacker mowed down up to a dozen pedestrians on bridge
- Four dead, including police officer and attacker
- Woman pulled injured but alive from Thames
A police officer is among four people killed after a knifeman brought terror to the heart of Westminster in London.
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 officers.