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

Dave Cullen: America "did nothing" until the Parkland school shooting

Saturday will mark 20 years since the shooting at Columbine High School, when two teen gunmen claimed the lives of 13 people. Journalist and "Columbine" author Dave Cullen joined CBSN to discuss the shooting and how it impacted the decades that have followed.

UP NEXT

UP NEXT

AdChoices
AdChoices

Reviews

image beaconimage beaconimage beacon