Thirteen people are dead and more than 20 people unaccounted for after heavy rain lashed Texas, leading to "catastrophic" flooding. Children are among the dead, and about 23 campers from a summer camp in the area, Camp Mystic, are unaccounted for, said Lt. Gov. Dan Patrick, who has taken on the duties of acting governor.

On Wednesday, hundreds prayed, wept, and held one another at a prayer service, among the first of many somber gatherings to come in the weeks ahead.