Police are appealing for witnesses following a series of deliberately-lit fires at the Pines Flora and Fauna Reserve in Frankston North.
Investigators say the first fire was reported on Sunday 24 November at 3.45pm.
A fire was started in long grass in the north-west corner of the reserve, just south of Ballarto Road and alongside the Peninsula Link noise barrier.
The second fire was started about 7.30am on Saturday 7 December on an embankment of the water catchment area to the west of the Orchard Track.
Police say as the CFA was extinguishing that fire, they observed another blaze about 200 metres away in scrubland adjacent to the Peninsula Link walking track.
After putting out both fires and heading back to base, the CFA crew observed another fire along the Peninsula Link track.
All the fires were quickly brought under control and put out by CFA teams.
Investigators are keen to speak to any witnesses and are hoping to speak to anyone who may have noticed any suspicious behaviour in the area leading up to the fires.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au
