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Rescuers in Washington state continued the desperate search for survivors overnight into Monday more than 36 hours after a massive mudslide killed at least eight people and destroyed 30 homes.
The slide turned a square mile of Snohomish County into a wasteland of mud, trees and wrecked buildings that Washington Gov. Jay Inslee described as "immense devastation."
Helicopters and crews on the ground have been forced to scour dangerous mud up to 15 feet deep in their search for the 18 people still unaccounted for.
Authorities were given hope on Saturday night when they heard people yelling from the darkness. But rescuers had to turn back with conditions becoming more dangerous, and when they returned next day there were no signs of life.
"The mud was just too thick and deep," Snohomish County Fire District 21 Chief Travis Hots said at a news conference Sunday. "We didn't find anybody alive."
"We have this huge square-mile mud-flow that's basically like quicksand," Hots told The Associated Press.
Five bodies were found Sunday, bringing the death toll to eight. Authorities said the number of people missing was 18 but Hots described this figure as "fluid."
The slide at around 11 a.m. locally also injured several people, including a 1-year-old infant.
The sheer depth of the mud made many conventional search techniques useless. "Thermal-imaging cameras are generally effective on a surface area. If someone’s buried, that won’t be effective," Hots said.
Rescuers who tried to reach affected homes on Saturday "got dragged in up to their armpits and had to be dragged out by ropes themselves," said Gov. Inslee during a briefing Sunday. Inslee had declared a state of emergency Saturday.
Two helicopters were deployed to search for victims, in hopes that rescuers would be able to trudge through the hazardous conditions to free them, Hots said.
Another risk to the 100 rescuers was the potential overflow of the Stillaguamish River, which has been blocked by the slide and was rising 10-12 inches every half hour, according to John Pennington, director of the Snohomish County Department of Emergency Management.
The river's dam breached "slightly" Sunday afternoon, according to the Snohomish County Sheriff's Office, but officials assured the "flow won't be catastrophic."
The cause of the slide appears to be that the ground was over-saturated by heavy rainfall, the Snohomish County government said in a statement.