INVESTIGATORS suspect arson in a fire that destroyed parts of a historic Southern army barracks.
The fire at the now privately-owned Brighton Army Barracks caused an estimated $100,000 damage.
Fire crews and police were called to the barracks on Monday night and found one of four buildings "fully ablaze".
"Other buildings have been vandalised, with damage, including smashed windows believed to have occurred sometime in the last 10 days," Bridgewater Detective Senior Constable Louise O'Connor said.
"The fire is being treated as suspicious."
The destroyed building, which was unoccupied, was due to be transferred to the Brighton City Council.
The Bridgewater fire brigade attended the fire and was able to save other buildings from going up.
Detectives are appealing for assistance from members of the community who may have observed any suspicious activity or people at the old barracks.
Anyone with information can contact detectives on 62684106 or anonymously through Crime Stoppers on 1800333000.