<sod >It is believed a total of four people have died, including a police officer and a woman, with a number of others suffering serious injuries, at Parliament and on Westminster Bridge, where a car ploughed into a crowd of pedestrians.< eod>< sod > Four people have died, including a police officer, a man believed to be theÃÂÃÂ attacker and a woman, with 20 others injured in incidents at Parliament and on Westminster Bridge.< eod>