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.
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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.
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It is illegal to introduce exotic fish, like piranhas, into Pennsylvania's waters.