Officials at the Comfort Volunteer Fire Department triggered a flood warning siren last week when the Guadalupe River began to swell.

Days after flash floods killed over 100 people during the July Fourth weekend, search-and-rescue teams are using heavy equipment to untangle and peel away layers of trees, unearth large rocks in riverbanks and move massive piles of debris that stretch for miles in the search for the missing people.

Officials are being pressed about their response and whether there could have been a better warning system.

When the precipitation intensified in the early morning hours Friday, many people failed to receive or respond to flood warnings at riverside campsites known to be in the floodplain.

Texas country singer Rich O'Toole on putting together relief efforts for victims of devastating flash flooding in the Lone Star State.