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(CNN)Authorities were investigating what appears to be a "credible threat" atColumbine High School and nearly 20 other schools, the Jefferson County Sheriff's Office in Colorado said Tuesday.
All Denver area schools should conduct a "lockout" and controlled release, according to a later tweet from the Colorado Department of Education.
Columbine High in Littleton and several schools in the area were earlier placed on a "lockout," the Jefferson County Sheriff's Office tweeted. Threats were not directed to a specific school, according to sheriff's spokesperson Mike Taplin.
Columbine lockout as 'credible threat' investigated - CNN
All Denver area schools should conduct a "lockout" and controlled release, according to a later tweet from the Colorado Department of Education.
Columbine High in Littleton and several schools in the area were earlier placed on a "lockout," the Jefferson County Sheriff's Office tweeted. Threats were not directed to a specific school, according to sheriff's spokesperson Mike Taplin.
Columbine lockout as 'credible threat' investigated - CNN