PC Keith Palmer, a member of the Parliamentary and Diplomatic Protection Squad, was killed as he tried, unarmed, to stop a terrorist at around 2.30pm on Wednesday.  Acting Deputy Commissioner Mark Rowley, the Met Police’s senior anti-terror officer, said two members of the public were fatally injured also.

The suspect, armed with two knives, had injured 29 people after mowing down pedestrians with a car on Westminster Bridge before crashing into railings in front of Parliament. He was shot dead after going through a gate towards the Palace of Westminster and attacking PC Palmer.

The two members of the public – a woman in her mid-40s and a man in his mid-50s – have not been identified. Deputy Commissioner Rowley said authorities believe the attacker, who has also not been named, acted alone and was inspired by international terrorism. He said: “There is no specific information about further threats to the public.” Following the attack the Prime Minister said the UK’s terror threat level would remain at severe.