The Latest: Schools alert after threat locks down Columbine

This combination of undated photos released by the Jefferson County, Colo., Sheriff's Office on Tuesday, April 16, 2019 shows Sol Pais. On Tuesday aut

This combination of undated photos released by the Jefferson County, Colo., Sheriff's Office on Tuesday, April 16, 2019 shows Sol Pais. On Tuesday aut

A student leaves Columbine High School late Tuesday, April 16, 2019, in Littleton, Colo. Following a lockdown at Columbine High School and other Denve

A student leaves Columbine High School late Tuesday, April 16, 2019, in Littleton, Colo. Following a lockdown at Columbine High School and other Denve

Students leave Columbine High School late Tuesday, April 16, 2019, in Littleton, Colo. Following a lockdown at Columbine High School and other Denver

Students leave Columbine High School late Tuesday, April 16, 2019, in Littleton, Colo. Following a lockdown at Columbine High School and other Denver

An officer from Jefferson County, Colo., Schools listens on his radio as students leave Columbine High School late Tuesday, April 16, 2019, in Littlet

An officer from Jefferson County, Colo., Schools listens on his radio as students leave Columbine High School late Tuesday, April 16, 2019, in Littlet

A Jefferson County, Colo. Schools officer blocks a driveway with a pylon outside Columbine High School as students leave late Tuesday, April 16, 2019,

A Jefferson County, Colo. Schools officer blocks a driveway with a pylon outside Columbine High School as students leave late Tuesday, April 16, 2019,

Students leave Columbine High School late Tuesday, April 16, 2019, in Littleton, Colo. Following a lockdown at Columbine High School and other Denver

Students leave Columbine High School late Tuesday, April 16, 2019, in Littleton, Colo. Following a lockdown at Columbine High School and other Denver

Students leave Columbine High School late Tuesday, April 16, 2019, in Littleton, Colo. Following a lockdown at Columbine High School and other Denver

Students leave Columbine High School late Tuesday, April 16, 2019, in Littleton, Colo. Following a lockdown at Columbine High School and other Denver

A student leaves by a scooter as parents wait in their vehicles for their children outside Columbine High School late Tuesday, April 16, 2019, in Litt

A student leaves by a scooter as parents wait in their vehicles for their children outside Columbine High School late Tuesday, April 16, 2019, in Litt

School police officers look on as students leave Columbine High School late Tuesday, April 16, 2019, in Littleton, Colo. Following a lockdown at Colum

School police officers look on as students leave Columbine High School late Tuesday, April 16, 2019, in Littleton, Colo. Following a lockdown at Colum

Columbine High School principal Scott Christy, right, joins an officer in watching as students leave the school late Tuesday, April 16, 2019, in Littl

Columbine High School principal Scott Christy, right, joins an officer in watching as students leave the school late Tuesday, April 16, 2019, in Littl

LITTLETON, Colo. (AP) — The Latest on threats that put Denver-area schools on alert (all times local):

12:40 a.m.

Education officials say Denver-area public schools will be closed Wednesday due to the an ongoing safety concern as authorities search for a woman who they say is armed, making threats and "infatuated" with the Columbine High School shooting.

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

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.

The Jefferson County Sheriff's Office and the FBI say Pais traveled to Colorado from Miami on Monday night and bought a pump-action shotgun and ammunition.

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10:15 p.m. Tuesday

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.