FBI Active Shooter Training

August 20, 2013 - 4:35 AM
In this Aug. 13, 2013 photo, police officers participate in an active shooter drill move down a hallway in a college classroom building in Salisbury, Md., as part of an FBI program that teaches local law enforcement best practices for responding to mass shootings. The goal is to promote a standardized strategy as multiple local police departments -- invariably the first officers at any scene -- respond to the same shooting. (AP Photo/Patrick Semansky)