Families sifted through waterlogged debris Sunday and stepped inside empty cabins at Camp Mystic, an all-girls summer camp ripped apart by flash floods that washed homes off their foundations and killed at least 78 people in central Texas.

Kerr County Sheriff Larry Leitha said in a press conference Sunday morning that, as of 9 a.m., 59 people have died in the catastrophic flooding stemming from a storm early Friday morning in Kerrville, Texas. Of the 59 victims, 38 are adults including 18 unidentified, and 21 are children including four unidentified.

Texas Gov. Greg Abbott warned Sunday that additional rounds of heavy rains lasting into Tuesday could produce more life-threatening flooding.