Four people have died and 20 people have been injured after what police are treating as terrorist attacks in Westminster, earlier on Wednesday. Here is what we know so far.
At 14.40 (GMT) the Metropolitan Police were called to an incident around Parliament Square in central London.
Reports made to the police included a person in the river, a car hitting pedestrians and a man armed with a knife.
Witnesses saw a car drive across Westminster Bridge and hit a number of pedestrians walking on the pavement.
These included three police officers who were walking across the bridge on their way back from a commendation ceremony.