Australian counter-terrorism investigators have searched two properties in suburban Melbourne the day after a man killed one person in a horrific terrorist attack in Bourke Street.

Police identified the attacker as 30-year-old Hassan Khalif Shire Ali.

Victoria Police Commissioner Graham Ashton said in a television interview that Shire Ali was known to authorities.

“He is certainly someone who is known to both us and the federal authorities in relation to counter-terrorism and terrorism-related matters,” he told Channel 7’s Sunrise program.

The Commissioner also told media that Shire Ali had a criminal history for driving offences, cannabis use and theft, AAP reports.

Shire Ali had set fire to a pickup truck laden with gas cylinders in the centre of Melbourne on Friday and stabbed three people, killing one, before he was shot by police.

“Joint Counter Terrorism Team investigators are executing search warrants at two addresses in Werribee and Meadows Heights this morning” Victoria police said in a statement.

“More information will be provided when it’s appropriate to do so.”

Authorities also confirmed on Saturday that they have spoken to Shire Ali’s wife.

Islamic State claimed responsibility for Friday’s attack, but that could not be substantiated and police have not commented on it yet.

The attack began just before the evening rush hour and lasted only minutes. While the utility truck carrying barbecue gas cylinders burned on busy Bourke Street, Shire Ali stabbed bystanders and attacked police.

The cylinders did not explode and the fire was put out in 10 minutes, by which point the attack was over, though not before one man was fatally stabbed.

Video posted to Twitter and broadcast on television showed the man swinging a knife at two police officers, before he collapsed when one shot him in the chest. He later died in hospital.

Bourke Street reopened Saturday

Bourke Street reopened on Saturday morning, and a Reuters reporter said there was an increased police presence in the area.

A staunch U.S. ally, Australia has been on alert for such violence after a Sydney cafe siege in 2014, and its intelligence agencies have stepped up scrutiny, though Ashton said there was no warning of the latest attack.

He said there was no longer a threat to the public, but that security would be boosted at horse races and Remembrance Day memorials over the weekend. Sunday marks 100 years since the armistice was signed that marked the end of World War One.

– with Reuters