The Lewisville Fire Department combed a large area of Lewisville Lake on Wednesday in search of a missing swimmer.
Investigators said they received a 911 call at about 6:30 p.m. after a man went missing near a boat. Chief Richard Lasky said two men went swimming off their pontoon boat, but drifted away from the boat. One swimmer got tired and didn't make it back to the boat.
While divers looked underwater, crews on boats used sonar equipment.
At nightfall, the swimmer had not been found. Crews will resume their search Thursday morning.