Stunning video shows ice roof collapsing at Big Four Ice Caves

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A video posted to YouTube shows an ice cave roof collapsing at the Big Four Ice Caves in Granite Falls, Washington.

Sara Soleimani, who shared the video with KIRO 7, says people were inside the cave during the collapse, but they were not under the ice when it fell.

>> UPDATE: 1 killed, 4 hurt in collapse at Washington's Big Four Ice Caves

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

"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.