Armed police walk past emergency services attending to a man on the floor (top) and a police officer (centre right) outside the Palace of Westminster, London, after a policeman was stabbed and his apparent attacker shot by officers in a major security incident at the Houses of Parliament. (Photo by Stefan Rousseau/PA Images via Getty Images)
Conservative MP Tobias Ellwood (bottom right) stands amongst the emergency services at the scene outside the Palace of Westminster, London, after policeman has been stabbed and his apparent attacker shot by officers in a major security incident at the Houses of Parliament. (Photo by Stefan Rousseau/PA Images via Getty Images)
Emergency services attend a man (top) and a police officer (bottom) outside the Palace of Westminster, London, after a policeman was stabbed and his apparent attacker shot by officers in a major security incident at the Houses of Parliament. (Photo by Stefan Rousseau/PA Images via Getty Images)
Emergency personnel on Westminster Bridge, close to the Palace of Westminster, London, after policeman has been stabbed and his apparent attacker shot by officers in a major security incident at the Houses of Parliament. (Photo by Dominic Lipinski/PA Images via Getty Images)
Emergency personnel on Westminster Bridge, close to the Palace of Westminster, London, after policeman has been stabbed and his apparent attacker shot by officers in a major security incident at the Houses of Parliament. (Photo by Dominic Lipinski/PA Images via Getty Images)
