ARSONISTS set light to two derelict buildings in March on Sunday.
At 2.25pm, one crew from March and one crew from Chatteris were called to a derelict workshop on Gas Road.
They extinguished the fire using one hose reel and returned to their fire station by 3.10pm.
At 4.30pm, one crew from March and one crew from Chatteris were called to a disused highways depot on fire at Queens Street.
Firefighters arrived and extinguished a small fire using small gear to cut away at sections.
They returned to their fire stations by 5.20pm.
The cause of both fires are believed to be deliberate.
Anyone with information on either of these incidents should contact the police on 0345-456-4564, or the independent charity Crimestoppers anonymously on 0800-555111, or by logging onto www.crimestoppers-uk.org