ALLEGHENY COUNTY, Pa. (WPVI) --Visitors to a Pittsburgh-area lake are being warned that someone put a dangerous piranha in the water.
A young fisherman caught the razor-toothed fish in North Park Lake.
But it flipped back into the water while he and his mother were trying to take it off the hook.
Officials think the fish is a discarded pet.
It is illegal to introduce exotic fish, like piranhas, into Pennsylvania's waters.