Four people have been killed and at least 20 injured in what the police are describing as a “terrorist incident” this afternoon in central London. Shortly after 2pm, a man drove a vehicle into pedestrians at Westminster Bridge before crashing it against the fences of Parliament and then entering the complex wielding a knife. He stabbed a police officer before being shot by other officers. Those killed are the attacker, one police officer and two pedestrians. The House of Commons was put on lockdown.