Also: San Antonio mourned the victims in a Travis Park vigil; UTSA said one of its teachers died in the Guadalupe River flood; Kerrville officials said a privately owned drone collided with a helicopter conducting search and rescue operations.

Sunday is a day of prayer across Texas. But as many filed into churches, first responders and volunteers filed into Kerr County, holding out up in their search and rescue efforts.

New human settlements constructed in recent years have made the waterway more hazardous, UT-Arlington civil engineering professor says.

Before hundreds of first responders and volunteers from around the country came to help, it was the local residents of Texas Hill Country who faced down a deadly wall of water along the Gaudalope River and witnessed terrifying scenes.

Despite officials urging civilians to stay away, volunteers have joined the search for missing people and the cleanup on the Guadalupe River. (The Associated Press)

Hill Country residents and volunteers on Tuesday continued picking up the pieces that the deadly waterway left behind days earlier.

Despite officials urging civilians to stay away, volunteers have joined the search for missing people and the cleanup on the Guadalupe River.

Several Kerrville Independent School District teachers and staff members drove school buses full of hundreds of campers from Camp La Junta and Camp Mystic to reunification sites on July 4.