Six days after flash floods swept through parts of Texas Hill Country and killed at least 120, authorities say there are still more than 160 people unaccounted for, as thousands of searchers combed through piles of mud-covered debris for survivors on Thursday.

Nearly a week after deadly floods struck Central Texas, search and rescue teams are continuing to probe debris for those still missing.

As crews search for missing people after flash floods killed at least 120 in Texas, cities across the U.S. grapple with rising flood waters.

Rescue efforts included over 2,100 responders on the ground, private helicopters, drones, boats and cadaver-detecting dogs.

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