Three people died and at least 40 were injured when an attacker drove a car along a pavement in Westminster, London - he then stabbed a policeman and was shot dead in the grounds of the Houses of Parliament. The so-called Islamic State group has said it was behind the attack, in which PC Keith Palmer, Aysha Frade and US tourist Kurt Cochran were killed. Here the BBC's Matthew Price retraces the route by walking across Westminster Bridge. Please subscribe HERE http://bit.ly/1rbfUog

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