"It's certainly not the first threat that we've had that involves Columbine High School, or references it".
Dean Phillips, special agent in charge of the Denver FBI, said a "massive" manhunt was ongoing Tuesday night and the woman had last been spotted in the foothills west of Denver. She was last seen wearing a black t-shirt, camouflage trousers and black boots and was last seen in the Jefferson County foothills.
Officials didn't provide further details or reveal where Pais traveled from, saying it would compromise their investigation.
Sheriff's spokesman Mike Taplin said the threats she made were general and not specific to any school. "She is armed & considered to be extremely risky", the sheriff's office said on Twitter, adding that Pais was wearing a black T-shirt, camouflage trousers and black boots and was last seen in the Jefferson County foothills. It's not clear where she came from. Multiple schools are on lockout in Columbine area & Mountains.
Students are leaving classes after tightened security at Columbine High School and over 20 other Denver-area high schools after a lockdown caused by a possible threat.
The Aurora Police Department said it was "taking this threat seriously" and that it was working with Aurora Public Schools and Cherry Creek Schools.
He said he had no other information.
On April 20, 1999, two students killed 12 of their schoolmates and one teacher in a mass shooting at the high school in the town of Littleton - about 10 miles from Denver. The FBI in Denver won't say what types of threats she allegedly made, but that she was "infatuated" with Columbine. They say she should be considered armed and extremely risky.
The Colorado Department of Education encouraged schools in the metro area to go into a lockout and run a controlled release of students at dismissal. As the district prepares for the day's memorial events, it is fending off an onslaught of curious strangers who trespass in the school's parking lot - sometimes more than 30 people in a day. City police have provided extra security as students were being released, the district tweeted.
Schools in the greater Denver area will be closed Wednesday as authorities search for a woman whom they described as armed and "infatuated" with the Columbine mass shooting days before the 20th anniversary of the attack. She never got in trouble at school. Phillips said that would not prevent authorities from apprehending Pais.
Jefferson County Public Schools tweeted a list of 22 elementary, middle and high schools placed under lockout.
The students walked to crosswalks and buses parked near the entrance. The massacre was the deadliest school shooting in American history at the time.
Officials said after school activities will be held at all schools except Columbine, but didn't explain why.
The FBI alerted Jefferson County authorities to the threat around 11 a.m., the Jefferson County Sheriff's Office said.
Please call the Federal Bureau of Investigation tipline at (303) 630-6227 where your call will be answered immediately if you have seen this individual or have information on her whereabouts.
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