A car repair workshop near Burgess Hill was engulfed by flames early today.
About 30 firefighters battled with the fire on the Bolney Grange Industrial Estate, near Burgess Hill.
Crews from Burgess Hill, Keymer and Hurstpierpoint arrived just after midnight.
Ivor Henley, station commander at Burgess Hill, said: "The unit was well alight. One car was completely destroyed."
The car repair unit was severely damaged and other units were smoke damaged.
Firefighters cooled gas cylinders to prevent them exploding in the heat.
An ambulance stood by but no one was injured.
Firefighters remained at the scene until 4.30am and left one crew behind to damp down.
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