The gun that police believe William Spengler Jr. used to kill two firefighters and severely injure two others is the same type of weapon used in the Newtown, Conn., school massacre 10 days earlier.
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But the Bushmaster .223-caliber rifle has a history in high-profile incidents of gun violence in the U.S.
It's not "gun violence" it's "Shots of Freedom at 30 rounds a minute".