As first responders continue to rescue people stranded by the torrential flooding that descended on central Texas Friday, dozens of people are facing a parent’s worst nightmare: Their children are missing.

Heavy rains unleashed a “catastrophic” and deadly flood Friday on the Guadalupe River in Central Texas, prompting evacuations and a frantic search for missing people. At least 32 people were killed in the flood, officials said Saturday afternoon, as both state and county authorities emphasized many unknowns remain.