London attack: 'There appeared to be a body in the water'
A police officer has been stabbed in the Houses of Parliament in central London, in what police are treating as a terrorist incident.
The attacker, who was shot by police officers, is reported to have earlier mowed down several pedestrians as he drove a car across Westminster Bridge.
Eyewitness Steve Voake was on the bridge when the events unfolded.
- From the section UK