Rescuers scoured a devastated central Texas landscape of mangled trees, overturned cars and muck-filled debris Saturday in an increasingly bleak mission to locate survivors, including 27 girls who have not been seen since their camp was slammed with a wall of water in a historic flash flood.

The Guadalupe River rose 26 feet in just 45 minutes before dawn Friday, washing away homes and vehicles. More than two dozen children remained missing from a camp along the river.