The F.B.I. and law enforcement officials in Colorado were searching on Tuesday for a woman who they said had made threats in the Denver area and was armed and “extremely dangerous.” Security was tightened at schools across the region, with the threats coming just days ahead of the 20th anniversary of the Columbine High School shooting.

An F.B.I. bulletin sent to local law enforcement identified the woman as Sol Pais, 18. She was “infatuated” with the Columbine attack, the bulletin said, and had been “attempting to buy firearms.”

The @FBIDenver & JCSO are asking for the public’s help regarding a potential credible threat. Last night Sol Pais traveled to Colorado & made threats. She is armed & considered to be extremely dangerous 1/3 pic.twitter.com/2x5iwddsMp

— Jeffco Sheriff (@jeffcosheriffco) April 16, 2019

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Officials also released an image of Ms. Pais, and said she was approximately 5-foot-5, with brown hair. She had recently traveled to Colorado, they said. Records show that Ms. Pais is from Surfside, Fla., in Miami-Dade County.

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