Authorities say a Pennsylvania man has died after he was found unconscious at the bottom of a friend's in-ground swimming pool in Hopewell.

Hopewell Township police say Collin Abrams, a 21-year-old Bucks County resident, was found early Saturday.

It was not immediately clear what caused the accident. Authorities say Abrams was last seen swimming by himself about 30 minutes before he was found.

When police arrived on scene, Abrams had been taken out of the 8-foot deep-end of the pool and CPR was being administered. He was taken to a hospital, where he was pronounced dead at 4 a.m.

The accident remains under investigation.

(Copyright 2012 by The Associated Press.  All Rights Reserved.)

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