A teenage terrorism suspect shot dead in Melbourne greeted two officers with a handshake before stabbing them multiple times, police say.
The 18-year-old Narre Warren man, who police believe may have previously displayed an ISIS flag, met the officers outside Endeavour Hills police station on the city's outskirts on Tuesday night.
He then stabbed one, an AFP officer, a number of times, before twice stabbing a Victorian officer in the forearm, Victoria Police Assistant Commissioner Luke Cornelius said.
Mr Cornelius said the Victorian officer fired a single shot that killed the man.
"Our members had no inkling that this individual posed a threat to them," he told reporters at the scene early on Wednesday morning.
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"It's absolutely clear to us that our members really had no choice other than to act in the way in which they did."
Both officers were taken to hospital, where they remain in a stable condition.
AFP Commander Bruce Giles said the officers and the man had spoken cordially before the stabbing.
Confirmed an AFP member, from counter-terrorism unit, & Vic Pol officer were involved in Endeavour Hills shooting o/n.. @7NewsMelbourne— Kristy Mayr (@KristyMayr7) September 23, 2014
Police say pair were with an 18 yr old man, related to an ongoing investigation, when situation turned violent.. @7NewsMelbourne— Kristy Mayr (@KristyMayr7) September 23, 2014
The homicide squad investigated scene of shooting overnight.. Professional Standards Command also involved, given police fired deadly shot..— Kristy Mayr (@KristyMayr7) September 23, 2014
Reports the teenage victim of fatal Endeavour Hills shooting was a terror suspect, under surveillance after threatening PM Tony Abbott..— Kristy Mayr (@KristyMayr7) September 23, 2014
Terror suspect shot dead by police at Endeavour Hills had displayed ISIS flag in public, & recently had his passport cancelled.. He was 18..— Kristy Mayr (@KristyMayr7) September 23, 2014
Police had invited teen terror suspect to Endeavour Hills cop shop.. say he came freely.. but then brandished a knife & began stabbing..— Kristy Mayr (@KristyMayr7) September 23, 2014
"The incident took place in the course of normal greetings; so, meeting with the individual, shaking hands, introducing and then the incident unfolded," he said.
He said it appeared the man had been acting alone.
Both officers were taken to hospital after being stabbed. Picture: Twitter
Commander Giles confirmed there was information suggesting the man had recently been seen with a flag of the jihadist group ISIS, also known as Islamic State.
However, Commander Giles said the officers had wanted to speak to the man about a "routine" issue.
"Police had cause for concern," he said.
Neither police spokesman would comment on media reports that the man had made specific threats against Prime Minister Tony Abbott.
Mr Cornelius said police had not singled the man out.
"Where we see individuals behaving in a way which causes concern for public safety, we have to reach out to those individuals," he said.
Police would not confirm the man's name or occupation, or comment on suggestions he had recently had his passport cancelled.
Bomb squad members and police dogs scanned the scene, but Mr Cornelius said the measures were precautionary.
The homicide squad and professional standards officers are investigating.