Members of the public know where a man accused of killing two police officers is hiding out nearly a week after the alleged ambush murders, investigators believe.

"People know the whereabouts of the person who's killed two cops," Superintendent Brett Kahan told reporters.

"People have chosen, for whatever reason, not to come forward, and I'm taking this time to appeal to you to come forward in that respect."

Freeman has been at large since Tuesday following an incident at his property in Porepunkah, about 300km northeast of Melbourne.

The 56-year-old is accused of killing Detective Leading Senior Constable Neal Thompson, 59, and Senior Constable Vadim De Waart, 35.

Investigators have received more than 450 pieces of information in connection to the search.

A police bus has also been set up in the town of Bright, 10 minutes' drive from Porepunkah.

The bus is stationed outside the church on Ireland Street and will be staffed by police officers during the day, every day. 

Locals are encouraged to drop by and speak to police.

Dezi Freeman is believed to be heavily armed as he continues to elude capture. – AAP

Supt Kahan said he couldn't confirm whether charges would be laid against Freeman's wife Amalia.

She was arrested alongside their 15-year-old son at a Porepunkah home last week.

"It's two different things to be speaking with police and co-operating with police," Supt Kahan added in reference to Ms Freeman.

"If people such as the fugitive's wife isn't giving us full co-operation, I would encourage you to do so."

The appeal for information comes as funeral arrangements for the slain officers are finalised.

Police officers Vadim De Waart and Neal Thompson were fatally shot while serving a warrant. – AAP

Snr Const De Waart will be farewelled on Friday, followed by the funeral for Det Snr Const Thompson on September 8.

Both services will be held at the Victoria Police Academy with full police honours. Neither will be open to the public.

Premier Jacinta Allan, Police Commissioner Mike Bush and other leaders observed a moment of silence in Melbourne to honour the fallen officers.

The minute's silence was held at a meeting of the state's cabinet on Monday, with Bush in attendance.

"Chief – we stand with your colleagues and their families. So do the Victorian people," Allan posted on social media.

It is alleged Freeman shot three officers while they were undertaking a warrant at his property. 

More than 400 police officers from Victoria, plus interstate colleagues, have been battling sometimes blizzard-like conditions as part of the search.