Armed police have swooped on a man suspected of carrying a knife outside parliament – putting Westminster in lockdown.
Police have confirmed a man has been arrested on suspicion of possessing a knife. Westminster is said to be on lockdown as police vehicles flood the scene.
Dramatic pictures show armed police pinning a man on the floor outside the House of Parliament – just yards from where Westminster attacker Khalid Masood rammed a vehicle into a fence and knifed PC Keith Palmer. The man, in his 30s, is said to have been tasered by police.