Authorities want to ensure a Florida teenager obsessed with the Columbine school shooting was acting alone as dozens of Denver-area schools plan to reopen following a region-wide hunt for the young woman.

According to the FBI, the body of Sol Pais was discovered in the mountains outside Denver with what appeared to be a self-inflicted gunshot wound Wednesday, about 24 hours after Columbine and other schools locked their doors in response to fears she intended to carry out her own attack.

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Authorities say Pais never threatened a specific school, but made troubling remarks to others about her "infatuation" with the 1999 shootings.

The FBI also says Pais purchased a shotgun Monday, immediately after arriving in Colorado.

The anniversary of the Columbine attack is Saturday.