MS NOW

As mass shootings rise, Eric Holder calls for better police training

Attorney General Eric Holder says police need "aggressive national response protocols" to stop shooters in their tracks.

A Connecticut State Police tactical team searches a train station near an elementary school, which was in a lockdown, in Ridgefield, Conn. on Dec. 17, 2012 following the shooting at Sandy Hook Elementary School in Newtown.
A Connecticut State Police tactical team searches a train station near an elementary school, which was in a lockdown, in Ridgefield, Conn. on Dec. 17, 2012 following the shooting at Sandy Hook Elementary School in Newtown.AP

Trymaine Lee

Trymaine Lee is an NBC News correspondent.