As authorities launch one of the largest search-and-rescue efforts in recent Texas history, they have come under intensifying scrutiny over preparations and why residents and youth summer camps that are dotted along the river were not alerted sooner or told to evacuate.

Flash floods in Texas killed dozens and left an unknown number of July Fourth visitors and campers missing, including many girls attending Camp Mystic. The devastation along the Guadalupe River, outside of San Antonio,