More than 20 schools have been temporarily placed on lockdown in Colorado as United States authorities investigate a "credible threat" just ahead of the 20th anniversary of the notorious Columbine High School shooting.
The FBI said Sol Pais, 18, is "considered to be extremely dangerous" and "made threats to commit an act of violence in the Denver metropolitan area" just days before the 20th anniversary of the attack that killed 13 people.
Denver Public Schools said that all facilities and programs will be closed Wednesday, and there will be no afternoon activities or athletic competitions.
After the threat was made public, all Jefferson County schools were placed on lockout status.
Pais is considered a threat to the community and schools, but there is no information on any specific threat to a particular location, Phillips said.
The FBI is now looking for a woman they say is "obsessed" with the Columbine High shooting. They say she should be considered armed and extremely unsafe.
They include the Douglas County School District, Aurora Public Schools, Jefferson County Public Schools and Cherry Creek Schools.
Officials didn't provide further details about the threats or say where she was from. But a sheriff's office spokesman, Mike Taplin, said the anniversary of the Columbine mass shooting was not a "direct" factor.
An officer from Jefferson County, Colo., Schools listens on his radio as students leave Columbine High School on Tuesday.
Two hours after announcing the lockouts, the school system reported that all students and staff were safe, adding that students would be released from the schools and buses would run on their normal schedule, though some may be slightly delayed.
Federal Bureau of Investigation agents, along with Jefferson County Sheriff's deputies and Colorado state troopers, have searched for her, including hunting through rural Jefferson County foothills throughout the day and have published her name and photo in local media.
Jenny Fulton, another sheriff's spokesperson, said the FBI was investigating the apparent threat. The school district in Jefferson County, which enrolls 86 000 students, pointed to the "ongoing safety concern", instructing all students and staff to stay home for the day. Michael Davis' daughter was killed in 2013 at her school in the same district as Columbine.
In Denver public schools alone, there have been 22 lockdowns and 294 lockouts over the past two academic years, according to school data cited by the Denver Post.
All after-school activities will go on as scheduled, except for at Columbine High School, where all after-school activities have been canceled. There was no immediate indication whether there was any connection to the anniversary.
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