The Northern Territory has ordered a review of people on parole and under active monitoring, following Darwin's worst mass shooting, and the arrest of Ben Hoffmann after he was released from prison only a month ago.
The 45-year-old alleged gunman went on a rampage, killing four men and injuring a woman while looking for a man named "Alex" on Tuesday night.
He had previously breached parole by breaking curfew, for which he was given a 14-day custodial sentence in late April, NT Commissioner for Corrections Scott McNairn said.
When Hoffmann was jailed in 2015, his victim Hussain Garling, who was bashed with a baseball bat in front of his infant son, told the court he "needs to be put away for a very long time, because he will do worse to someone next time".
The violence has raised questions about why he was released in January after serving a non-parole period of four years of his six-year sentence, given his extensive criminal history.
He was also able to go on a violent rampage for an hour while wearing an electronic tag.
Police Commissioner Reece Kershaw said ankle bracelets were not police tactical tools and were related to parole.
Mr McNairn said his department had recommended Hoffmann get parole and he had asked the Parole Board chair to provide a report on him.
"We take reasoned decisions in terms of how we balance risk and those individuals are thoroughly risk assessed before we make any decision," he told reporters.
Chief Minister Michael Gunner said he had asked for both a report from the Parole Board on both Hoffmann and a review of all people currently on parole and on electronic monitoring.
There are 196 people being actively monitored in the NT.
Of the 103 on parole, 46 were also being electronically monitored.
"This work will be thorough. It will be completed by the end of next week. While we have no reason to believe an event like this will occur again, it is critical we make every effort that it does not," Mr Gunner said.
The deadly violence started at 5.39pm at the Palm Motel where Hoffmann allegedly shot and killed taxi driver Hassan Baydoun, who was on a meal break.
Mr Baydoun's cousin Abdallah Salman said his 33-year-old relative did not know the shooter and was accidentally caught up in a random shooting as the gunman went from room to room firing his gun and shouting for Alex.
Police have contacted Alex, who was interstate.
A 22-year-old woman at the Palm was shot in the legs and is in hospital in a stable condition.
Over the next hour, the shooter went on to kill 52-year-old casino security guard Rob Courtney at a home in Jolly St, Woolner, a 75-year-old in Gardens Hill Crescent and a man, 57, in the car park of the Buff Club in Stuart Park.
Hoffmann was tasered and arrested, was in hospital under guard on Wednesday and was yet to be charged.
Police said they were unsure whether any of the victims knew Hoffman.
Police had the serial number of a prohibited pump-action 12-gauge shotgun used in the shootings that might have been stolen, Mr Kershaw said.
