school shooting
A 17-year-old girl was taken into custody for a threat directed at Larry A Ryle High School, Kentucky. In this image, school buses are lined up in front of Great Mills High School after a shooting in Great Mills, Maryland, March 20, 2018. Mark Wilson/Getty Images

The FBI and Denver police issued a warning Wednesday about an armed Miami woman, who is obsessed with the 1999 Columbine High School massacre and has made threats to more than 20 schools in the Denver area.

Sol Pais, 18, reportedly flew from Miami to Denver and is considered "extremely dangerous." Denver Mayor Michael B. Hancock announced that several school districts will be closed Wednesday while authorities search for Pais.

During a press conference, FBI Denver Special Agent Dean Phillips told reporters that Pais immediately bought a pump-action shotgun and ammunition not long after landing. He added that Pais had made "concerning comments in the past" and expressed an "infatuation" with the Columbine shooting, which involved two students who shot and killed 12 other students and one teacher on April 20, 1999.

The Jeffco Sheriff’s Department also posted about the threat Pais posed on its Twitter, letting people in the area know she had "traveled to Colorado & made threats."

Pais' last reported location was in the Jefferson County foothills.

In response to early reports, several schools, including Columbine High School, were placed on "lockout" Tuesday. "Lockout" means that while class is in session, all ways of entering or exiting the school is restricted. The announcement was made on the Jeffco Public Schools Twitter.

Pais' father on Tuesday reportedly begged her to come home. He has not seen her since Sunday.

"She can please come home," he told WTVJ, an NBC affiliate in Miami. "I think she’s going to be O.K."