Key questions remain unanswered about the actions Texas officials took both before and during the catastrophic July Fourth holiday floods remain unanswered.

Rescue efforts include more than 2,100 responders on the ground, private helicopters, drones, boats and cadaver-detecting dogs.

U.S. President Donald Trump is heading to central Texas on Friday to survey damage from the July 4 flash flood that killed at least 120 people and left dozens more missing. His visit comes amid intense focus on the government response a week after the storm and as thousands of first responders comb through muddy debris,