Active shooters continue to strike American workplaces on a daily basis. While every attack is different, there are commonalities -- including confusion.

In recent incidents a "good guy with a gun" at an Alabama mall was killed mistakenly while the shooter got away, a police officer was killed in a Chicago emergency room in pursuit of a suspect and police rushed to the scene of another Chicago business for what turned out to be a well-intentioned but poorly communicated active shooter drill. 

Recent active shooter attacks at military bases in California and Florida are a stark reminder that deadly violence can break out at any workplace or public venue. While every attack is different, there are commonalities -- including cases where intended victims are protecting themselves and even fight back.

Recent active shooter attacks at military bases in California and Florida are a stark reminder that deadly violence can break out at any workplace or public venue. While every attack is different, there are commonalities -- including cases where intended victims are protecting themselves and even fight back.