Bendigo Crime Investigation Unit detectives are hoping to speak to a male seen in the White Hills area on Saturday afternoon, as their investigations into the suspicious Bobs Street fire continue.
Emergency services responded to the grass fire about 3.30pm on Saturday.
The fire quickly spread and was threatening surrounding businesses and residential properties, with residents of Strickland Street evacuated as a precaution.
No one was injured during the incident and no property was damaged.
It is understood a male wearing a blue helmet and riding a black mountain bike attended an address on Bobs Street about 3pm and advised occupants to contact Triple Zero.
Investigators are hoping to speak with this male as he may be able to assist with their enquiries.
Police also believe there were a number of people on the O'Keefe Trail between Bobs and Murphy streets sometime between 2.30pm and 3.15pm who may have seen the male or have information.
The investigation remains ongoing.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at crimestoppersvic.com.au
Have you signed up to the Bendigo Advertiser's daily newsletter and breaking news emails? You can register below and make sure you are up to date with everything that's happening in central Victoria.
Sign up for our newsletter to stay up to date.