Firefighters spent three hours putting out a blaze in a storage building in Singleton Park in Swansea.
Four fire engines, from Swansea West, Swansea Central, Morriston and Gorseinon, and a turntable ladder from Morriston were called to the park at 2150 BST on Friday.
The fire was in a two-storey, 20 by 30-metre building used for storage by Swansea council’s parks department.
The fire was put out and the crews left the scene at 0050 BST.
The building is used to store chairs for outdoor events at the park.
Fire investigation officers and scenes of crime officers from South Wales Police will be at the park later to investigate how the fire started.
The blaze comes a month after fire severely damaged the 19th Century Swiss Cottage in the park.
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