Two crews from Cambridge and a crew from Cottenham were called to reports of smoke in the area of Park Lane, Histon.
A single storey barn measuring 5m by 3m containing garden machinery and a tractor was on fire. Firefighters wearing breathing apparatus set up a water shuttle and used hose reels to prevent the fire from spreading to involve adjacent property and to extinguish the barn.
The crews returned to their stations by 7am.
The cause of the fire was deliberate. Anyone with information should contact the police on 101 or the independent charity Crimestoppers anonymously on 0800 555111.
Station Commander Paul Clarke said: "The fire had been burning for some time before we arrived and had completely engulfed one end of the barn. The firefighters did a fantastic job by creating a fire break to stop it spreading to the adjoining workshop. Their actions have prevented a much more significant loss."
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