Schools on high alert after threat locks down Columbine

LITTLETON, Colo. (AP) - Schools in the Denver area are on heightened alert after authorities say a woman who is "infatuated" with the 1999 shooting at Columbine High School made threats just days before the 20th anniversary of the attack that killed 13 people.

Authorities are looking for 18-year-old Sol Pais after undisclosed threats prompted Columbine and more than 20 other schools outside Denver to lock their doors for nearly three hours Tuesday afternoon.

All schools in the Denver area were urged to tighten security, and some canceled evening activities or moved them inside.

Investigators say Pais traveled to Colorado from Miami on Monday night and bought a shotgun and ammunition. Police who might come into contact with her were told to detain her and evaluate her mental health.

Denver Public Schools said all facilities and programs will be closed Wednesday, and there will be no afternoon activities or athletic competitions.

The district said the decision to close campuses was in collaboration with other Denver metro-area school districts.

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