AIRVILLE – Rescue crews searched for an 18-year-old man missing in the Susquehanna River over the weekend. State Police say crews were called at about 6:15 p.m. Saturday to the Muddy Creek boat access in Lower Chanceford Township in York County. The man was swimming with two juvenile male friends just south of the Norman Wood Bridge when he was swept downstream and they lost sight of him. The search was called off at about 9:30 p.m. Saturday due to dangerous conditions. The effort was to resume just before 10 a.m. Sunday. So far, the missing man has not been located.