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A lock-up garage in Rochester went up in flames after several sofas inside caught alight.
Fire crews from Strood and Medway tackled the blaze at the garage behind homes in Fleet Road at about 1.30pm.
It is the second time firefighters have been called out to the property in just over a week.
Strood crew manager Ken Spratt, said: "It was damaged after some youngsters using it as a bit of den lit a bonfire in there."