Texas parents frantically posted photos of their young daughters on social media with pleas for information as more than 20 campers from an all-girls summer camp were unaccounted for Friday after floods tore through the state's south-central region. At least 13 people were dead Friday and dozens missing after months worth of heavy rain fell in a matter of hours on Texas Hill Country, Kerr County Sheriff Larry Leitha said.

The flood-prone region is dotted with century-old summer camps that draw thousands of kids annually from across the Lone Star State. Lt. Gov. Dan Patrick said about 23 girls attending Camp Mystic, a Christian camp along the Guadalupe River in Hunt, Texas, were unaccounted for Friday afternoon. Search teams were working to conduct helicopter and boat rescues in the fast-moving floodwaters. "I'm asking the people of Texas, do some serious praying this afternoon " on-your-knees kind of praying " that we find these young girls," Patrick said.

Dozens of families shared in local Facebook groups that they received devastating phone calls from safety officials informing them that their daughters had not yet been located among the washed-away camp cabins and downed trees. Camp Mystic said in an email to parents that if they have not been contacted directly, their child is accounted for.