A Sytner showroom in High Wycombe caught fire last night.
About 30 firefighters attended the blaze at a BMW showroom, in London Road, near Wycombe Retail Park, at about 10pm.
Seven fire engines were called, with crews using breathing apparatus, thermal imaging cameras as they extinguished the flames.
Bucks Fire and Rescue has now confirmed the blaze started in the workshop of the commercial garage. The extent of the damage is not known.