All clear signaled at Columbine High School after threat issued

· Sep. 22, 2014, 3:53 pm

Columbine High School in Littleton is back to normal operations after a lockout was lifted around noon Monday.

Earlier in the day, no one was allowed to leave the school after it received a threat. Melissa Reeves, news media specialist for Jefferson County Schools, wouldn't tell CPR News the nature of the threat.

The Jefferson County Sheriff’s office is investigating.

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