Firefighters say the blaze in St Helier this afternoon is believed to be caused by an explosion inside a garage.
Ryan Hall, from Jersey Fire and Rescue Service, says work was being done to a vehicle before it happened.
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The weekend event coincides with International Pride Month and the 51st anniversary of the Stonewall riots.
The scheme has been backed by the island's Lieutenant-Governor, and is the first of its kind in the Channel Islands.
Sunny spells and isolated light showers. After dusk fair spells with isolated showers.