A massive manhunt for an 18-year-old Florida woman, who was "fascinated" with the Columbine High School massacre and had made "credible threats" that led to the closure of several Colorado school districts, CNN reported, has ended.

Sol Pais was found with an apparent self-inflicted gunshot wound, Sheriff Jeff Shrader of Jefferson County, Colorado, said Wednesday.

The teenager made the threats during her "pilgrimage" to Colorado, according to special agent Dean Phillips of the Denver FBI office, CNN said.

What's the story?

Pais purchased a plane ticket and flew from Florida to Colorado on Monday night, just days ahead of the 20th anniversary of the Columbine shooting that left 13 dead on April 20, 1999, police said.

Pais' parents contacted Surfside Police Department Monday night and reported their daughter missing, the Miami Herald reported.

The teenager, who was a senior at Miami Beach Senior High School, was last seen wearing camouflage pants, black boots, and a black T-shirt, officials said.

Authorities in Miami contacted Colorado officials, which prompted the massive manhunt.

Immediately after she arrived in Colorado, Pais purchased a pump-action shotgun and ammunition, according to the FBI.

Dean Phillips, the special agent in charge of the Denver FBI office, said Pais had made "credible threats" following her arrival in the area, CNN reported.

The FBI's Rocky Mountain Safe Streets Task Force reportedly described the teenager as "infatuated with [the] Columbine school shooting" in a bulletin on Tuesday. Pais was considered "armed and dangerous," authorities said.

Nearly 20 school districts in the region canceled classes while authorities tried to locate her. After she purchased the firearm, Pais was last seen in the foothills west of Denver, according to authorities.

Phillips did not identify any specific threats against any school or district during a press conference Wednesday after the woman's body was found.