Testimony will be heard from those in charge of managing rivers as well as emergency managers and first responders about the flash flooding that killed at least 135 people.

Texas lawmakers on Wednesday were set to begin reviewing the July 4 floods that killed at least 135 people, a disaster that put local officials under scrutiny over why residents along the Guadalupe River did not receive more warnings.

Authorities determined that three people are still missing from the floods, a sharp drop from the approximately 100 people authorities had previously said were unaccounted for.