Three people were flown to Harborview Medical Center, the regional trauma center. A 25-year-old man is in critical condition, a 35-year-old man is in serious condition and a 35-year-old woman is in satisfactory condition at Harborview Medical Center.

A juvenile female was taken to Providence.

>> RELATED: Stunning video shows ice roof collapsing at Big Four Ice Caves

Authorities said the body of the person killed is still inside the cave and has not been recovered.

The Sheriff’s Office helicopter was dispatched to the Big Four Ice Caves shortly before 6 p.m. and responders headed to the Verlot Visitors Center, which is 11 miles east of Granite Falls on the Mt. Loop Highway.

Earlier ice cave collapse in nearby area

A video posted to YouTube on Monday shows an ice cave roof collapsing.

Sara Soleimani, who shared the video with KIRO-TV, says people were inside the cave during the weekend collapse, but they were not under the ice when it fell.

In the video, people walk out of the cave after the collapse; one is shaking his head as others observed the fallen ice.

>> PHOTOS: Partial ice cave collapse at Big Four Ice Caves

"You could [have been] killed," a woman either shooting or near the camera said.

Many signs around the cave tells hikers to not go inside it.

Watch the video (WARNING: graphic language) on YouTube here.

Forest Service gave ice cave warning in May

In late May, the Forest Service warned that a trip to the Big Four Ice Caves could be deadly. The caves were unstable, crumbling and collapsing because of the low amount of snowpack.

"I counted 442 people within like a three-hour time span,” Anissa Smith, a ranger with the Forest Service, told KIRO-TV in May.

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Smith witnessed a partial collapse from the top of the cave earlier that month and said they were the most unstable she’d seen.

It’s not illegal to go into the caves, but there are several signs telling visitors to stay out.

In 2010, a young girl died when a chunk of ice the size of a truck crushed her.