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

Denton firefighters are in Kerrville on Sunday to assist with search, rescue and recovery efforts after the deadly floods along the Guadalupe River.

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.

Kerr County, Texas and national search and rescue operations will continue Monday around the Guadalupe River, where families wait for news of their loved ones.

Camp Mystic was overrun by flash flooding that started on Independence Day. Rapidly rising waters ripped through the century-old all-girls Christian summer camp, killing at least 27 people. Others are still missing.