Arsonists are believed to have set fire to a car on the A1198 near Godmanchester.
A crew from Huntingdon was called to the blaze at 3.46am on Thursday May 23.
Firefighters arrived to find a car well alight and extinguished it using a hose reel.
They returned to their station by 5am.
The cause of the fire is believed to be deliberate.
Anyone with information should contact police by visiting www.cambs.police.uk to submit an online report or call Crimestoppers on 0800 555111.
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