Eleven girls from a summer camp along the Guadalupe River in the Texas Hill Country are among those unaccounted for. Forecasters warned of more rain and possible flash flooding in hard-hit areas on Sunday.

At least 68 deaths—including the deaths of 21 children—have now been confirmed in the central Texas flash floods, according to the latest update from officials, though dozens of children from a summer camp remain unaccounted for as blame swirls over preparedness and whether residents were properly alerted.