Police are investigating a fire that damaged the pavilion in Stanley Park, Blackpool.
Firefighters were called out to the park at 4pm on Saturday, after reports from the public.
A spokesman for Lancashire Fire and Rescue said: “We had reports that kids had caused a fire against the pavilion, near to the netball courts.
“By the time we arrived, the fire had spread to the pavilion and caused some damage.
“Police are now investigating.”