A machete-wielding man was shot dead by police in south London Sunday after injuring three people in a stabbing spree that officials are calling a “terrorist-related” attack.

“The circumstances are being assessed,” London’s Metropolitan Police said in a statement. “The incident has been declared as terrorist-related.”

The incident took place on Streatham High Road in the city’s Streatham neighborhood around 2 p.m. local time, authorities said.

“I saw a man with a machete and silver canisters on his chest being chased by what I assume was an undercover police officer — as they were in civilian clothing,” Gulled Bulhan, a 19-year-old student told Britain’s Press Association. “The man was then shot. I think I heard three gunshots but I can’t quite remember.”

Police said one of the victims is being treated for life-threatening injuries, while the other two suffered less severe injuries.

One witness, a nurse, told the South London Press that “a man just went into a shop and took a knife and started stabbing people.”

“The shopkeeper tried to get the knife away from him but he got away and stabbed a woman on a bicycle. The knife was really big,” she said. “I saw three people injured — one of them might have been the attacker.”

Another witness told the outlet that one victim, a man, was stabbed in the stomach and a second, a woman, was stabbed in the back.

“The woman was saying, ‘He stabbed me,'” the witness said. “The man was in a bad way. People were screaming, ‘stay with us.’ It was a big wound.”

“The police arrived and we heard, ‘bang, bang, bang.’ I saw the attacker lying down face down outside Iceland (food store.)”

Video posted by the BBC shows the street flooded by emergency vehicles in the aftermath of the shooting, with officers ordering pedestrians to move back from the scene.

London’s Ambulance Service said “a number of resources” were sent to the scene, but the conditions of the alleged victims are not currently available.

Home Secretary Priti Patel praised “our brave police and emergency services and their families” for their response to the attack on Twitter.

“Thank you to all emergency services responding in Streatham, which the police have now declared as terrorism-related,” British Prime Minister Boris Johnson said on Twitter. “My thoughts are with the injured and all those affected.”