Matthew Gant said 14-year-old Mary Steele Gant was at Camp Mystic in central Texas when the camp was overwhelmed by flash flooding, WMC Action News 5 reported. Rain overwhelmed the Guadalupe River on July 4, causing it to rise as much as 26 feet in less than two hours.

In 1987, sudden and intense rainfall caused the river to surge at an unprecedented rate in mid-July, leading to a tragedy that killed 10 campers at Pot O' Gold Christian Camp, a summer camp near Comfort, Texas. The campers drowned when their bus attempted to evacuate them and was overtaken by floodwater.

Search efforts continue for the dozens of people still missing after Friday's floods, as questions swirl over what went wrong. Here's what we know so far.