Firefighters were called to a suspicious fire in a tree at a campsite in bushland between Shepparton and Mooroopna on Wednesday, May 6.
Two CFA crews, as well as Fire Rescue Victoria and Forest Fire Management Victoria officers, attended the fire at a campsite along a track at about 5.10pm.
A CFA spokesperson said the fire was mainly contained to a tree, but that firefighters had been concerned, as there were scrap piles and rubbish nearby.
The fire was declared safe at 5.30pm.
No-one was in the camp at the time.
FFMV continued to monitor the site after the fire was extinguished in case it reignited.
A police spokesperson said the fire was being treated as suspicious and the investigation remained ongoing.
Anyone with information or anyone who may have witnessed any suspicious activity in the area, with dashcam/CCTV footage is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at crimestoppersvic.com.au