A landslide in Washington state near the small town of Darrington left a muddy debris field that blocked State Road 530 and included remnants of six homes.

• Rescuers searched for people crying for help in the debris
• 5 airlifted to one Seattle hospital, including a baby and 2 men in critical condition
• At least 6 homes are destroyed; the road and a river are blocked
• Locals are urged to evacuate for fear of a “catastrophic flood event”

A devastating landslide in Washington state killed three people Saturday and sent rescuers desperately digging for people crying for help underneath debris, authorities in Washington state said.

The landslide cut off a small town and a river and prompted an evacuation notice for fear of a potentially “catastrophic flood event,” authorities said.

The Snohomish County Sheriff’s Office said, in addition to those dead, seven adults and a 6-month-old boy were rescued and sent to local hospitals.

Harborview Medical Center in Seattle reported that five patients had been airlifted there and were in its care. Three of those — including the baby, a 58-year-old man and an 81-year-old man — were in critical condition Saturday night, according to spokeswoman Susan Gregg.

The first Washington State Patrol trooper arrives on the scene, according to the patrol's Twitter feed.

People were crying out for help from underneath debris early Sunday, said City of Arlington fire Capt. Brandon Asher. Rescuers are trying to forge through the wreckage to get to them.

At least six houses were destroyed in the landslide and possibly 16 were damaged, the sheriff’s department reported.

The first reports of the landslide came in around 10:45 a.m. (1:45 p.m. ET) along State Road 530, the sheriff’s office said.

Photos provided by the Washington State Patrol show floodwaters and sprawling debris covering a rural patch of that two-lane road, framed by woodlands and snow-capped mountains.

CNN first learned of the landslide via Twitter.

Emergency workers arrive at the scene of the landslide.

Groundwater saturation tied to heavy rainfall in the area over the past month was blamed for the landslide, which authorities say measured at least 45 yards wide.

Because it blocked SR 530, the landslide cut off Darrington, a town of about 1,350 people located 75 miles northeast of Seattle and within close proximity to Round Mountain, Whitehorse Mountain and White Chuck Mountain. Part of the Stillaguamish River also was blocked.

Residents got reverse 911 calls warning them of “flooding upstream from the slide, as well as the possibility of a downstream flooding should there be a catastrophic breach by the river,” said Shari Ireton, a sheriff’s spokeswoman.

The county later said “we strongly recommend” that those living in the north fork of the Stillaguamish River flood plain, from Oso to Stanwood, to “evacuate your home immediately.”

“We are working on establishing shelters for those who have nowhere to go,” county spokeswoman Rebecca Hover said in a statement. “Until then, people should get to higher ground as soon as possible.

“Nightfall is approaching, and we do not want to take any chances.”

Gov. Jay Inslee expressed dismay later Saturday about the “tragedy in Oso,” the remote community of about 180 people 15 miles west of Darrington.

“The situation along the Stillaguamish River is extremely dangerous,” he said in a statement. “Anyone along the flood plain of the Stillaguamish between Oso and Stanwood should leave the area before dark due to risk of catastrophic flooding.”

Police cars and other vehicles line the highway near the scene of the landslide.

A number of agencies have responded, including the state transportation and emergency management departments, the U.S. Navy and fire departments across Snohomish County.

Upon arriving at the scene, firefighters and state troopers heard calls for help, trooper Mark Francis said.

The Snohomish sheriff warned people to stay clear of trestles or bridges or anywhere near the Stillaguamish River downstream of the slide.

“Water could break through at any moment,” the sheriff’s office tweeted.

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