You are using an older browser version. Please use a supported version for the best MSN experience.

Days Before the Columbine Shooting's 20th Anniversary, a 'Credible Threat' Puts Denver Schools in Lockout

Columbine High School other schools in the Denver metro area were on high alert Tuesday after officials announced that there was a “credible threat,” just four days before the 20th anniversary of the historic school shooting.
image beaconimage beaconimage beacon