The attack started shortly before 15:00 GMT when the car was driven over Westminster Bridge, hitting and injuring a number of members of the public – including the three police officers, who were on their way back from a commendation ceremony.

After the car crashed, a man armed with the knife “continued the attack and tried to enter Parliament

Officer dies from stab wounds and police shoot dead attacker after assault on Houses of Parliament, A woman was among several pedestrians struck by a car on Westminster Bridge, before it crashed into railings. Police said an officer protecting Parliament was stabbed by an attacker, who was shot by police.

At least 20 people were injured, including three other officers. Armed police at Parliament were able to stop the attacker. Within minutes, Westminster was flooded with more armed officers, including counter-terrorism specialists.

Five of the injured and have been taken to the major trauma centre at Kings College Hospital London, according to the BBC.

The former prime minister David Cameron has tweeted this. My thoughts with the families of those injured & killed. Those seeking to attack our democracy with these barbarous methods will never win.

We offer our deepest sympathy to the family of the officer who has died.