Tobias Ellwood, the Tory foreign minister, was praised as an "absolute hero" after he tried to save the life of a policeman stabbed in the Parliament attack.

The Tory MP attempted mouth-to-mouth resuscitation and applied pressure on the wounds to stem the blood flow to keep him alive but said he had "lost too much blood".

Mr Ellwood, a former soldier himself, attended the victim as he awaited medical staff and an air ambulance to arrive in Parliament Square. He was later seen with bloodied hands talking to police officers near the scene before going back to the Foreign Office.