The police have said that a man arrested outside Buckingham Palace on Friday night was brandishing a 4ft sword as he repeatedly shouted “Allahu Akbar.”
Dean Haydon, head of counter-terrorism at Scotland Yard, said the man drove at a police vehicle before stopping and being confronted by three officers.
CS gas was used to “quickly” restrain the 26-year-old from the Luton area who is now in custody, Cdr Haydon said.
The three unarmed Westminster police officers received minor injuries. Two of them were taken to hospital after receiving cuts to their hands and forearms.
Counter-terror police are investigating after the man was arrested on suspicion of grievous bodily harm and assault under the Terrorism Act.