POLICE are confronting developing feedback over their treatment of the Bourke St slaughter including whether they let affirmed driver Jimmy Gargasoulas escape before the butchery started.

Officers had been attempting to capture Gargasoulas, 26, for whatever length of time that 16 hours before he is claimed to have cut down walkers in the CBD, killing five individuals — including two youngsters — and harming handfuls more.

Victoria Police Commissioner Graham Ashton has affirmed police did attempt and "box in" the Holden Commodore time and again.

"On this last event we were attempting to get him from the early morning ... We got near him a few circumstances," Mr Ashton told Neil Mitchell on3AW.

"To be sure we were attempting to seek after him on one event attempting to lift him up."

He said there were likewise times seeking after police attempted to "box in" the auto, incorporating into the CBD on Swanston St.

Some other time was on the Bolte Bridge when Gargasoulas' better half Akiir Muo figured out how to escape the auto. Witnesses say the auto was "encompassed" by police at the time, something not denied by Mr Ashton — but rather despite everything he figured out how to get free and head towards the CBD.

Online networking has been overwhelmed with irate individuals from general society who need to know why he was not halted. Film of Gargasoulas doing burnouts outside Flinders Street Station have additionally maddened Australians, who accept there was sufficient time to accomplish something to stop him before he entered Bourke St Mall.

These are the key inquiries police are confronting as the Coroner starts her "criminological" examination about what could have been done any other way.

WHY DIDN'T THEY RAM THE CAR?

Mr Ashton advised 3AW it wasn't police approach to slam vehicles as a method for ceasing them, to a great extent because of the peril it puts police staff in.

"To slam autos isn't police approach, it isn't the typical thing to do," he said.

Hindering an auto in was another procedure that was utilized and police attempted this. Mr Ashton said the alternative of slamming an auto was something that would just happen in "extraordinary" conditions.

"Be that as it may, that would have been experiencing those officers' brains that morning."

He didn't know about a demand by staff, inconsequential to the Bourke St occurrence, for unique autos that could slam vehicles.

WERE THE POLICE CALLED OFF?

Inside hours of the disaster sources inside the police said there had been seven events where they could have securely attempted to block Gargasoulas.

In any case, the assertion is that on every event staff were advised not to endeavor it by their bosses.

Police Association secretary Detective Senior Sergeant Ron Iddles told Fairfax one of those circumstances was late morning on Chapel St while the Commodore was in substantial activity.

"It couldn't move. That is the proper time to take an auto out," he said.

Amid his 3AW meeting, and furthermore amid a media gathering at the end of the week with Premier Daniel Andrews, Mr Ashton said he didn't accept there had been seven open doors.

"That is not what I'm seeing on the [police] logs."

In any case, he didn't deny there had been openings.

"As I've said some time recently, there's chances where you search for circumstances and search for the most secure strategy ..."

WHY DIDN'T POLICE ACT OUTSIDE FLINDERS STREET STATION?

Mr Ashton said there were police there, including formally dressed staff who were doing against social crusades.

At the point when the burnouts started their quick concentration was to stop different autos entering the crossing point, Mr Ashton said.

In any case, other police units, both noticeable all around and on the ground, that had been following Gargasoulas were shutting in.

"At that stage we had the air wing over this individual and autos attempting to surround him at the time."

THE CORONER WILL DECIDE

Mr Ashton said he was sure the police hadn't fizzled and was supporting his staff "100 for each penny".

Eventually, it will be up to the coroner to choose if the operation contained genuine imperfections since it would be analyzed in "measurable" detail.

"All that I'm seeing is indicating police individuals settling on split choices on the run, life and passing choices, about attempting to catch a guilty party ... They're feeling it [now] considering 'Hmm did I make the privilege decision','' Mr Ashton said.