The inquiry into the LynnMall stabbings is not expected to finalise its report until the end of August.
Photo: 2021 Getty Images
Ahamed Samsudeen injured eight people in a supermarket before being shot dead by police last September.
The Independent Police Conduct Authority said it was "well advanced" on completing the draft report.
However, a long consultation period would be needed on the draft "given the complexity of the issues", the IPCA's principal operations adviser Warren Young said.
Even then, after August, it cannot be released until it is checked for classified information.
"There might then be a process for determining what can be released into the public arena," he said.
It had been made clear no precise date for public release of findings could be given, Young added.
The IPCA is leading the three-agency inquiry into the police, Corrections and security service's decisions and actions that led up to the attack by Samsudeen, who security agencies began monitoring as a potential terrorist threat in 2017.