As the district prepares for the day's memorial events, it is fending off an onslaught of curious strangers who trespass in the parking lot of the high school - sometimes more than 30 people in a single day.
"Last night Sol Pais traveled here to Colorado and she made threats to commit an act of violence in this area, she is armed and considered risky", Mike Taplin of Jefferson County Sheriff's Office told local media. She was last seen wearing a black t-shirt, camouflage trousers and black boots and was last seen in the Jefferson County foothills. That list included Columbine, the site of a horrific massacre on April 20, 1999. All after-school activities will go on as scheduled, except for at Columbine High School, where all after-school activities have been canceled.
USA authorities are looking for a young woman who is "infatuated" with the 1999 shooting at Columbine High School and made threats just days before the 20th anniversary of the attack that killed 13 people.
The safety unit run by Jefferson County Public Schools is considered one of the most sophisticated school security systems in the country.
Have You Seen this Woman?The FBI Denver Division and Jefferson County Sheriff's Office are asking for the public's...
They didn't say where she traveled from.
A spokesperson for the FBI's Denver field office did not immediately respond to queries.
Jenny Fulton, a spokesperson for the sheriff's office, said the Federal Bureau of Investigation requested the sheriff's office assistance with ensuring the safety of the schools.
Students wearing backpacks came out the main door at Columbine at about 2.55pm local time, soon after school officials announced that students in all the schools put on lockdown were safe and would be dismissed at their normal times.
On Tuesday, the Jefferson County Sheriff's Office placed Columbine and 21 surrounding schools under a security "lockout", allowing activities inside to continue as usual but restricting entry and exit at the schools.
"She has made some concerning comments in the past. and because of that we were concerned", he said.
Officials have said Pais was "infatuated with (the) Columbine school shooting" and should be considered "armed and extremely dangerous". There was no immediate indication whether there was any connection to the anniversary.
The announcement of closures in metro-area school districts came in a tweet from the Colorado Department of Education shortly before midnight.
Officials didn't provide further details or reveal where Pais traveled from, saying it would compromise their investigation. "We want our schools to be a safe place for kids to learn".