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Armed police at the scene on Wednesday, March 22, 2017 outside the Palace of Westminster, London, after policeman was reportedly stabbed and his apparent attacker shot by officers in a major security incident at the Houses of Parliament

Armed police at the scene on Wednesday, March 22, 2017 outside the Palace of Westminster, London, after policeman was reportedly stabbed and his apparent attacker shot by officers in a major security incident at the Houses of Parliament