Man missing after car crash in Georgetown County, SC, jumps into Waccamaw River; ongoing joint rescue efforts.

Man missing after car crash in Georgetown County, SC; jumps into Waccamaw River. Driver involved in U.S. Highway 17 crash, exits vehicle, jumps off L.H. Siau Memorial Bridge into river. Joint rescue efforts ongoing by Georgetown County Sheriff's Office, Midway Fire Rescue, US Coast Guard, SC Highway Patrol, and Georgetown Police Department. Man last seen 300 yards east of bridge before vanishing underwater.