The investigation determined Butler likely displayed warning signs that were unrecognized ... Despite Butler’s research on ...

1 Mass shooters do not just snap, they often display noticeable, observable behavior. Recognizing and reporting the warning signs of someone preparing for violence can be lifesaving. 1 This list ...

Another program, the Avert training, "gives you the tools to understand how to recognize warning signs, react quickly in an active shooter situation, and learn how to control bleeding in life ...

A disturbing new pattern emerges in school shootings: extreme beliefs, dangerous archetypes, and a thirst for recognition.

Natalie Rupnow, who killed two during a school shooting, was pictured in the shirt at a gun range before the attack. Newsweek's live blog is closed.