TIMELINE: A day-by-day look at the deadly floods in central Texas

Thousands of first responders were still combing through piles of mud-covered debris in Texas Hill Country on Thursday, hoping against long odds to find survivors six days after flash floods swept through the region, killing at least 120.

A dozen states have dispatched search teams to Kerr County, where the vast majority of the victims perished when torrential rains sent a wall of water raging down the Guadalupe River in the predawn hours of July 4.

At least 96 people, including 36 children, died in Kerr County, officials said at a briefing on Thursday morning. Another 161 people remain unaccounted for. The last person found alive was on Friday, according to authorities.

The dead included 27 campers and staff members from Camp Mystic, an all-girls Christian summer retreat on the banks of the river. Five girls and one counselor from the camp remain missing, officials said.

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Kerr County sits at the heart of what is known as "flash flood alley" in central Texas, a region that has seen some of the country's deadliest floods.

More than a foot of rain fell in less than an hour early on July 4. Flood gauges showed the river's height rose from about a foot to 34 feet (10.4 meters) in a matter of hours, cascading over its banks and sweeping away trees and structures in its path.

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(Production: Sandra Stojanovic, Maria Alejandra Cardona, Evan Garcia, Jane Ross, Nathan Frandino)