Columbine High School on lockout after undisclosed threat

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The front doors at Columbine High School were locked for incoming and outgoing traffic during the school day on Sept. 22, 2014.

LITTLETON, Colo. — Columbine High School was put on lockout on Monday after the school received an undisclosed threat.

Jefferson County school district spokesperson Melissa Reeves confirmed that the school did receive a threat Monday morning, but said she could not disclose the nature of the threat or how it was received.

Lockout status means that classes at the high school continue as normal, with no one allowed in or out of the building.

A Jefferson County Sheriff’s Office spokesperson confirmed that they were investigating the threat, but that it “appears to be like the hundreds of other threats we’ve had over the years.”

Jefferson County officials have said in the past that it’s not rare for Columbine, the site of a school shooting in 1999 that left 15 dead, to receive generic threats, and that each one is investigated before determining what security measures are put in place.

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