Several fire departments responded to a large brush fire inside of an Allegheny County Park Tuesday afternoon. Allegheny County 911 officials say crews were called to Hartwood Acres Park in Hampton Township around 1:15 p.m. The Allegheny County Police Department says the fire was near a trail and grew to be about 100 by 100 yards. The fire is under control. One firefighter sustained a heat-related injury. The Allegheny County Fire Marshal is investigating to determine the origin and cause of the fire.