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At least three people were injured in a "terrorist-related" rampage in a London suburb that ended when police fatally shot a knife-wielding suspect wearing a fake explosive device, USA Today reported, citingMetropolitan Police. 

One victim suffered life-threatening stab injuries in the attack in Streatham, a town of 58,000, police said. Another person's injuries were not life-threatening and a third person was slightly injured, likely by broken glass following the shooting, deputy assistant police commissioner Lucy D'Orsi said.

The attacker, who recently served prison time for terrorism offenses, was killed by members of a counter-terrorism operation who were "in immediate attendance," she said. He was pronounced dead at the scene.

"The incident was quickly declared as a terrorist incident," D'Orsi said. "We believe it to be Islamist-related."

Bell Reberio-Addy, a member of Parliament who represents Streatham, said the attacker had been under surveillance “for some time.” No other information on the assailant was immediately available. 

Prime Minister Boris Johnson said the government would announce further plans for "fundamental changes to the system for dealing with those convicted of terrorism offences" on Monday, BBC reported.