Flames tore through the main building at the Crestmoor Swim Club on the 600 block of West Summit Avenue last week.
The building housed offices, locker rooms and a pump room.
Firefighters had a hard time getting water because of a jammed hydrant.
One firefighter was taken to the hospital with minor burns.
11 lifeguards have been put out of work and hundreds of children temporarily without a place to swim.
Damage was estimated at $100,000.
Anyone with information about this fire is asked to call the fire marshal's office at 302-323-5375
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