The teenager wounded the victim, 30, before he “rushed” at police and was hit by tasers and then a fatal shot last night in Perth, Australia.

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“There are indications he had been radicalised online. But I want to reassure the community at this stage it appears he acted solely and alone,” Premier Roger Cook said.

Police received a call late on Saturday from a male warning that he was going to commit “acts of violence” but without giving his name or location, the state’s police commissioner, Col Blanch, said.

Within minutes, another emergency call alerted police that a “male with a knife was running around the car park” in Willetton, a southern suburb of Perth, he said.

Police body camera images showed the teenager refused officers’ demands that he put down the knife, the police chief said.

The weapon was a one foot kitchen knife, believed to be from the attacker’s home, he said.

Officers fired two Tasers at him but “both of them did not have the full desired effect,” he said.

“The male continued to advance on the third officer with a firearm who fired a single shot and fatally wounded the male.”

The teenager died in hospital later in the night, he said.

The victim who had been stabbed was in a “serious” but stable condition and appeared to be doing well, the police commissioner said.

The man had suffered a single, “possibly” two centimetre stab wound that may have punctured a lung, he said.

Police believe the teenager sent “relevant messages” to some members of the Muslim community who immediately called police, he said, without giving details of the messages.

The boy had “mental issues but also online radicalisation issues”, the police chief said.

In the past two years, the attacker had been part of a “countering violence extremism programme” for people who show signs of “religious or issues-motivated” concerns, he said.

“It is not a criminal based approach but it is a programme to help individuals who are expressing ideologies that are of concern in our community. But they may not be committing any crimes.”

Police said they did not know what had triggered the attack.

Blanch said it had the “hallmarks” of a terrorist incident but he was not making an official declaration right now as he had no concerns about a wider network being involved.

Australian Prime Minister Anthony Albanese said he had been briefed by police and intelligence services who had advised there was no “ongoing threat”.

“We are a peace-loving nation and there is no place for violent extremism in Australia,” he said in a message on social media.

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