Camp Mystic, a private Christian summer camp for girls, had to be evacuated overnight after “catastrophic” flooding along the Guadalupe River.

Flooding in central Texas caused the Guadalupe River to flood. A Christian girls camp, Camp Mystic, was affected and some campers are missing.

Lt. Gov. Dan Patrick said in a press conference that 23 girls remain unaccounted for out of 750 from Camp Mystic, a Christian girls-only summer camp near the Guadalupe River, per Dallas outlet WFAA. (Floods in the river caused it to reach its second-highest height ever, according to ABC affiliate Eyewitness News .)