PATTON, Pa. (AP) — Search and rescue crews have been trying to find the body of a fisherman who went missing two weeks ago at a lake in central Pennsylvania.

Officials say the man, whose name hasn't been released, has been missing since June 22 at Prince Gallitzin State Park in Cambria County.

Park manager Jessica Lavelua said crews combed the surface of the park's Glendale Lake on Friday afternoon, and divers are scheduled to search over the weekend.

Lavelua said the man's boat was equipped with a GPS device, so searchers are pretty sure where he entered the water, but the body could have drifted since then.

She says divers have been hampered by sediment that makes the water so murky that they have difficulty even seeing bubbles coming from their own equipment.