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.

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

Extreme flooding began in the Texas Hill Country around 4 a.m. on July 4, as thunderstorms dropped more than 10 inches of rain on the region.

Officials in Texas are facing mounting questions about whether they did enough to get people out of harm’s way before a flash flood swept down the Guadalupe River and killed more than 100 people, including at least 27 children and counselors at an all-girls Christian camp.

Texas Gov. Greg Abbott says more than 160 people are believed to be still missing days after flash floods killed more than 100 people across central Texas