Columbine High School, more than 20 other schools in Jefferson County and one school in Denver have been placed on lockout Tuesday afternoon after sheriff's officials said they were investigating "what appears to be a credible threat possibly involving the schools".
Denver Public Schools advised that all facilities and programs would remain closed on Wednesday, with afternoon activities and athletic competitions canceled, AP reports. Pais traveled to Colorado by air from Miami, Denver FBI Chief Dean Phillips 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.
The FBI's Rocky Mountain Safe Streets Task Force issued a notice describing Pais as "infatuated with (the) Columbine school shooting".
There is no information about any specific threat to any particular school, but authorities believe she is a credible threat to the community.
"This has become a massive manhunt", Phillips said in a Tuesday night press briefing.
"I don't have that answer for you tonight", said Stan Hilkey, the executive director of the Colorado Department of Public Safety.
The FBI alerted Jefferson County authorities to the threat around 11 a.m., the Jefferson County Sheriff's Office said.
"Please do not approach her as she is considered armed and unsafe", the sheriff's office said.
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Complicating the case is the fact Pais has not technically committed a crime.
Schools throughout the city of Denver, Colorado will shut on Wednesday as authorities search for an "extremely dangerous" woman.
Authorities did not disclose how Pais came to the attention of law enforcement or how the alleged threats were conveyed.
Investigators say a woman who made undisclosed threats that led to tightened security at Columbine High School bought a pump-action shotgun and ammunition shortly after landing in Denver from Miami. "Children are safe. Deputies are at the schools".
Pais is thought to be obsessed with Columbine and recently flew to Colorado in a trip apparently timed to what Safe2Tell founder Susan Payne referred to in a post we published this morning as a "day of remembrance" for the April 20, 1999, attack, which killed twelve students and a teacher. There was no immediate indication whether there was any connection to the anniversary.
The 20th anniversary of the shooting at Columbine is Saturday.
All schools in the Denver metropolitan area were placed on lockout on Tuesday in response to the threats.
The Aurora Police Department said it was "taking this threat seriously" and that it was working with Aurora Public Schools and Cherry Creek Schools.