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Reports: UK police raid property linked to London attack

Associated Press
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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." London's police said officers had been called to a firearms incident on Westminster Bridge, near the parliament. Britain's MI5 says it is too early to say if the incident is terror-related. (Yui Mok/PA via AP). (The Associated Press)

An attacker is treated by emergency services, as knives lie on the floor, with police looking on at the scene 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). (The Associated Press)

Undated handout photo released by Metropolitan Police on Wednesday, March 22, 2017 of police officer Keith Palmer who was killed during the attack on the Houses of Parliament in London. A knife-wielding man went on a deadly rampage in the heart of Britain's seat of power Wednesday, plowing a car into pedestrians on London's Westminster Bridge before stabbing a police officer to death inside the gates of Parliament. Five people were killed, including the assailant, and 40 others were injured in what Prime Minister Theresa May condemned as a "sick and depraved terrorist attack." (Metropolitan Police via AP) (The Associated Press)

British armed police have carried out a raid on a property in the central city of Birmingham, after an attacker killed four people before being fatally shot by police within Parliament's grounds.

Police refused to say if the raid was linked to the rampage in the heart of Britain's seat of power. But British media including the Press Association on Thursday quoted an unnamed witness saying that the operation was linked to the attack that also injured around 40 people.

A knife-wielding man drove an SUV into pedestrians on Westminster Bridge before crashing the vehicle into the gates of Parliament on Wednesday. He scaled the fences and later fatally stabbed a policeman before being gunned down by officers. He hasn't been identified. Three pedestrians were among the dead.