Flash floods that swept through Texas over the Fourth of July weekend have left more than 100 people dead and dozens of others missing.

Fifty-nine people are dead as a result of the flooding and torrential rains in Kerr County, Texas, Sheriff Larry Leitha said during a Sunday-morning press conference. That tally includes 38 adults and 21 children, Leitha said.

Six counties reported deaths from multiple severe flood events since Friday, July 4. Also, Kerrville officials reported that a privately owned drone collided with a helicopter conducting search and rescue operations.