UPDATE 1.11pm: TWO people are being questioned by members of the police bushfire taskforce after they were seen acting suspiciously today.

The two men were arrested in Taggerty about 11am this morning, the HeraldSun and AAP.

Detectives are making inquiries regarding the men's recent activities in the Taggerty area, according to a police statement. 

Deputy Commissioner Simon Overland said there were two people in custody who were being questioned.

He said the two were not suspected of lighting fires but was in relation to "suspicious activity" in the area.

Mr Overland said police were close to releasing a photofit of the Churchill arsonist.

Taskforce Phoenix, the police body responsible for investigating the cause of Victoria's devastating bushfires, is understood to be involved at this early stage.

Earlier, Chief Commissioner Christine Nixon said arsonists could have been responsible for the fire that gutted Marysville

Part of the concern about the Marysville blaze was that there was no explanation for how it started, Ms Nixon said.

A fire that began at Churchill and killed at least 21 people was deliberately lit, police believe.

She said police had already spoken to some suspects over the deadly bushfires.

"We're obviously working very hard on that investigation and we've spoken to a number of suspects so far but it's still an ongoing investigation,'' Ms Nixon told the Seven Network today.


"We'll get there, but it is a matter of piecing together all of the evidence and getting information from the various groups so that we can add that to our current investigation.''

The bushfires death toll stands at 181, with expectations the final number will be much higher. So far, eight people have been confirmed killed in Marysville, but there are fears that figure could rise to up to 100.

The police's taskforce Phoenix was involved in the investigation, Ms Nixon said.

Read more on the HeraldSun online.