The terrorist attack in London was carried out by a man named Khalid Masud. About this in his Twitter reported Breaking News Feed, citing data from the local police.
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Breaking News Feed (@pzf)
23 March 2017, 15:30
March 22 at about 14:40 local time (17:40 GMT) in London, a car heading across Westminster bridge, drove onto the sidewalk, knocked a few people and drove to the Parliament building. There the offender was stopped by police. One of the patrol, the attacker was stabbed, but was shot by another guard. The attack killed four people.