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 (centre) helps emergency services attend to a police officer 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 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 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 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)
