London police say a 75-year-old man injured in the attack on Westminster Bridge has died of his wounds.
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In a statement late Thursday, police said life support was withdrawn from the man and his family has been notified.
The announcement brings to four the number of victims killed in the attack Wednesday in central London. The man identified as the driver of the car that rampaged across the bridge into pedestrians was also killed by police after he jumped out and stabbed a police officer to death.
Earlier Thursday, ISIS claimed responsibility for the attack. "The perpetrator of the attacks yesterday in front of the British parliament in London is an Islamic State soldier and he carried out the operation in response to calls to target citizens of the coalition," the group's Amaq news agency statement said.