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

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.

Survivors have described the floods along the Guadalupe River as a “pitch black wall of death” and said they received no emergency warnings.