Armed police detained a man armed with a knife just yards from the Houses of Parliament today in a new Wesminster security alert. The suspect was tackled at the Westminsrer end of Whitehall at around 2.45pm. Shocked eyewitnesses say road were immediately closed amid a heavy police presence after reports of a man with a backpack with 'knives' falling to the floor. The incident comes just 36 days after six people were killed in a terror attack at the heart of democracy Eye witness Luke William said: "Armed police in Westminster holding a man with a backpack with what appears to be knives falling out on the floor. Stay safe."