Colorado’s Columbine High School and at least 20 surrounding schools were placed under a “lockout” security alert on Tuesday as authorities cited a “potential credible threat” posed by an 18-year-old woman described as armed and “extremely dangerous.”
The alert came four days before the 20th anniversary of the April 1999 massacre at Columbine, when two heavily armed students stormed the suburban Denver high school and fatally shot 12 classmates and a teacher before committing suicide.
Tuesday’s lockout, less serious than a public safety “lockdown,” means activities inside schools may continue as usual but entry and exit are restricted, the Jefferson County Sheriff’s Office said on Twitter.
Officers were “investigating what appears to be a credible threat possibly involving the schools,” the sheriff’s department said on Twitter, adding that students were safe and additional deputies were dispatched to the schools.
The precise nature and circumstances of the threat were not immediately disclosed. But the sheriff’s office later said that an 18-year-old woman identified as Sol Pais was being sought by the Federal Bureau of Investigation and sheriff’s deputies in connection with the case.