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Ihsas Khan was on the radar: govt

AAP logoAAP 11/09/2016

Justice Minister Michael Keenan has urged Australian communities to be alert to people who's behaviour has changed and may be "problematic".

The call comes after Ihsas Khan was charged with terrorism related offences following the stabbing attack on Sydney man Wayne Greenhalg, 59, on Saturday.

"We need to continue to work with the community to get intelligence about people that they might be concerned about, people whose behaviour is changing, people who were saying things that are obviously problematic," he said on Monday.

Mr Greenhalg was stabbed several times while walking through a reserve near his home in Minto in Sydney's west.

He managed to reach a hair salon where the people inside locked the door and sheltered him.

Other neighbours tried to fend off his attacker, who was allegedly still pursuing his victim.

Mr Keenan said authorities had in the past been "very successful" in using information from communities to "stop 10 terror attacks in Australia".

"Unfortunately, of course we cannot provide a blanket guarantee," he told ABC radio.

Mr Greenhalg suffered injuries to his body and hands and remains in Liverpool Hospital in a serious condition.

Khan has been charged with committing a terrorist act and attempted murder.

NSW Police say the attack on Mr Greenhalg was "inspired" by Islamic State.

"We know that this person has strong religious beliefs inspired by ISIS," Deputy Commissioner Catherine Burn said on Sunday.

"It was deliberate and it was violent."

Khan is next due to appear in court on Wednesday.

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