A 20-year-old woman has died after falling through a skylight and onto the floor of a high school gymnasium, police in Columbia Falls said.

The woman and two others were on the roof of the gym at Columbia Falls High School at about 2:25 a.m. Sunday when the woman fell about 40 feet to the floor, police said.

Officers administered first aid, but the woman died of her injuries, police said in a social media post. Officers did not know why the trio was on the gym roof.

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A Montana woman died after falling through the skylight of the gym at Columbia Falls High School. (Fox News)

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The name of the woman was being withheld until family members could be notified.