Surviving campers sang hymns as they drove past the damage left by the floods. Days earlier, they were having fun and playing games at the all-girls Christian summer camp.

More than an hour passed between Camp Mystic receiving a severe flood warning and a decision to evacuate young campers asleep in cabins by the Guadalupe River.

The leader of Camp Mystic had been tracking the weather before the deadly Texas floods, but it is now unclear whether he saw an urgent warning from the National Weather Service that had triggered an emergency alert to phones in the area,