More than 50 people have died and dozens of children are missing in Texas Hill Country after catastrophic flooding, leaving officials struggling to explain if they had done enough to warn people of the fast-rising waters.

The youngest girls at Camp Mystic in Texas were asleep in cabins as little as 225 feet from the river when flash flooding suddenly surged — causing the water to rise 20 feet above flood stage in just 90 minutes, starting around 4 a.m. on July 4.