epaselect epa05863726 Armed police react following a major incident outside the Houses of Parliament in central London, Britain 22 March 2017. Scotland Yard said on 22 March 21017 the police were called to a firearms incident in the Westminister palace grounds and on Westminster Bridge amid reports of several people injured in central London. EPA/ANDY RAINConservative Member of Parliament Tobias Ellwood, centre, helps emergency services attend to an injured person outside the Houses of Parliament, London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. (Stefan Rousseau/PA via AP).epaselect epa05863643 Armed police push people backfollowing a major incident outside the Houses of Parliament in central London, Britain 22 March 2017. Scotland Yard said on 22 March 21017 the police were called to a firearms incident in the Westminister palace grounds and on Westminster Bridge amid reports of several people injured in central London. EPA/ANDY RAINCOMBO ATTENTATO LONDRACOMBO ATTENTATO LONDRACOMBO ATTENTATO LONDRACOMBO ATTENTATO LONDRAepaselect epa05863794 Armed police following major incidents outside the Houses of Parliament in central London, Britain, 22 March 2017. Scotland Yard said on 22 March 21017 the police were called to a firearms incident in the Westminister palace grounds and on Westminster Bridge amid reports of several people injured in central London. EPA/WILL OLIVEREmergency services transport an injured person to an ambulance, close to the Houses of Parliament in London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. (ANSA/AP Photo/Matt Dunham)Emergency services staff provide medical attention close to the Houses of Parliament in London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. (ANSA/AP Photo/Matt Dunham)Armed police walk past emergency services attending to injured people on the floor outside the Houses of Parliament, London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. (Stefan Rousseau/PA via AP).Emergency services transport an injured person to an ambulance, close to the Houses of Parliament in London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. (ANSA/AP Photo/Matt Dunham)Emergency services staff provide medical attention close to the Houses of Parliament in London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. (ANSA/AP Photo/Matt Dunham)Emergency services transport an injured person to an ambulance, close to the Houses of Parliament in London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. (ANSA/AP Photo/Matt Dunham)An armed police officer stands on Parliament Square outside of the Houses of Parliament in London, Wednesday, March 23, 2017 after the House of Commons sitting was suspended as witnesses reported sounds like gunfire outside.(ANSA/AP Photo/Kirsty Wigglesworth) [CopyrightNotice: AP 2017]epa05863602 Armed police following major incidents outside the Houses of Parliament in central London, Britain 22 March 2017. Scotland Yard said on 22 March 21017 the police were called to a firearms incident in the Westminister palace grounds and on Westminster Bridge amid reports of several people injured in central London. EPA/ANDY RAINEmergency services at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. (Stefan Rousseau/PA via AP).Emergency services staff provide medical attention close to the Houses of Parliament in London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. There are also reports of a vehicle hitting pedestrians on nearby Westminster Bridge. (ANSA/AP Photo/Matt Dunham)epa05863662 Armed police react following a major incident outside the Houses of Parliament in central London, Britain 22 March 2017. Scotland Yard said on 22 March 21017 the police were called to a firearms incident in the Westminister palace grounds and on Westminster Bridge amid reports of several people injured in central London. EPA/ANDY RAINPolice on the scene after sounds similar to gunfire have been heard close to the Houses of Parliament, London, Wednesday, March 22, 2017. The UK House of Commons sitting has been suspended as witnesses report sounds like gunfire outside. (Victoria Jones/PA via AP)Emergency services staff provide medical attention close to the Houses of Parliament in London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. There are also reports of a vehicle hitting pedestrians on nearby Westminster Bridge. (ANSA/AP Photo/Matt Dunham)Emergency personnel tend to an injured person close to the Palace of Westminster, London, Wednesday, March 22, 2017. London police say officers called to a ‘firearms incident’ on Westminster Bridge, near Parliament. The leader of Britain’s House of Commons says a man has been shot by police at Parliament. David Liddington also said there were “reports of further violent incidents in the vicinity.” Britain’s MI5 says it is too early to say if the incident is terror-related. (Yui Mok/PA via AP).epa05863659 A video grabbed still image, made available by former Polish foreign minister Radoslav Sikorski, showing people attending to an injured person at the Westminster Bridge, near the Houses of Parliament in central London, Britain 22 March 2017. Scotland Yard said on 22 March 21017 the police were called to a firearms incident in the Westminster palace grounds and on Westminster Bridge amid reports of several people injured in central London. EPA/RADOSLAV SIKORSKI BEST QUALITY AVAILABLEArmed police officers enter the Houses of Parliament in London, Wednesday, March 23, 2017 after the House of Commons sitting was suspended as witnesses reported sounds like gunfire outside.(ANSA/AP Photo/Kirsty Wigglesworth) [CopyrightNotice: AP 2017]An Air Ambulance on the scene after sounds similar to gunfire have been heard close to the Houses of Parliament, London, Wednesday, March 22, 2017. The UK House of Commons sitting has been suspended as witnesses report sounds like gunfire outside. (Victoria Jones/PA via AP)Police on the scene after sounds similar to gunfire have been heard close to the Houses of Parliament, London, Wednesday, March 22, 2017. The UK House of Commons sitting has been suspended as witnesses report sounds like gunfire outside. (Victoria Jones/PA via AP)Roads are closed off by police after sounds similar to gunfire have been heard close to the Houses of Parliament, London, Wednesday, March 22, 2017. The UK House of Commons sitting has been suspended as witnesses report sounds like gunfire outside. (Victoria Jones/PA via AP)Police on the scene after sounds similar to gunfire have been heard close to the Houses of Parliament, London, Wednesday, March 22, 2017. The UK House of Commons sitting has been suspended as witnesses report sounds like gunfire outside. (Victoria Jones/PA via AP)a Lon