At just after midnight on 1 March, CFA were called to reports of a fire being lit behind the Warburton Post office.
CFA attended, however were unable to locate the fire.
Then at approximately 1.10am, CFA were again called to Warburton for a bushfire on the north side of the Yarra River near the Redwood Bridge.
CFA were able to get the fire under control, however, it was still threatening properties on Blackwood Avenue.
Police are seeking assistance from the public to identify those responsible, or to identify any further small fires lit during this period.
Anyone who witnessed the incident or with footage is urged to contact Yarra Ranges Crime Investigation Unit on (03) 9739 2401.
Alternatively, to submit a confidential report, contact Crime Stoppers on 1800 333 000 or www.crimestoppersvic.com.au
