Crews from Chatteris and March were called to a car fire on the A141 at Wimblington yesterday.
A single vehicle had left the carriageway near the junction with King Street, and fired following a collision.
Three casualties were out of the car on the arrival of the fire service, who gave them first aid alongside paramedics.
Firefighters used two hose reels to extinguish the fire and returned to their stations by 9.30pm.
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