Two cars went up in flames in a supermarket car park, causing huge plumes of thick, black smoke.
Firefighters from Sherborne were sent over the border to Morrison's in Yeovil after two cars caught on fire just after 5pm.
A spokesman for Sherborne Fire Station said they could see a "large black plume of smoke" as they approached the area.
It is believed just one car was on fire at first, but the spokesman added: "The fire was so intense that it spread to another car parked nearby."
The blaze was extinguished, but both cars were completely destroyed.
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