FILE - This undated file image provided by the City of Houston shows a scene from a video the city made to teach people how to react in the case of an active shooting situation using a

 

              FILE - This undated file image provided by the City of Houston shows a scene from a video the city made to teach people how to react in the case of an active shooting situation using a
FILE - This undated file image provided by the City of Houston shows a scene from a video the city made to teach people how to react in the case of an active shooting situation using a short, three-word mantra: Run, hide, fight. Even as we struggle to learn the details behind the mass shooting at Sandy Hook Elementary School in Newtown, Conn., the sad frequency of attacks by men with guns is creating a growing school of thought based on a simple premise: Be ready for the bullets. (AP Photo/The City of Houston, File)