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At least five people were killed, including the assailant, in an attack on Wednesday that is suspected of being influenced by “international terrorism”, Scotland Yard said.
The attack that took place outside the UK’s parliament injured 40 people, according to Mark Rowley, the UK’s most senior counterterror officer.
Prime minister Theresa May addressed Britain earlier in the evening, confirming that police believe a single attacker ploughed through pedestrians on the Westminster Bridge before fatally stabbing a police officer and then being shot by police.
Mr Rowley said that Scotland Yard’s “working assumption” is that the attacker was “inspired by international terrorism”. He declined to provide further detail on the person’s identity.