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Columbine High School On Alert After Threat

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A woman visits the grave site of Columbine High School student Rachael Scott at Chapel Hill Memorial Gardens near Littleton, Colo., on Monday, April 20, 2009, the 10th anniversary of the shooting at Columbine High School. Rachael Scott and eleven other students and teacher Dave Sanders were killed at the school. (AP Photo/Ed Andrieski) | ASSOCIATED PRESS

LITTLETON, Colo. (AP) — The Jefferson County Sheriff's Office says Columbine High School, the scene of a school shooting that left 15 people dead in 1999, is on a high security alert after an undisclosed threat.

The sheriff's office says in a tweet that the school is on lockout, which does not require students to take shelter, after authorities were notified of a telephone threat. The alert also applies to a half-dozen other schools in the area and was issued shortly before noon.

In 1999, two students opened fire at Columbine High School in Littleton, Colo., killing 12 classmates and a teacher and wounding 26 others before killing themselves in the school's library.

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Threat cited at Columbine High School; area schools on alert