ABC News 12 killed, up to 10 wounded in Navy yard shooting

WASHINGTON -- DC mayor says that at least 12 people have been killed and as many as 10 wounded in a shooting at the Washington Navy Yard. A federal law enforcement official and a Defense Department official said Monday morning that a shooter had died. Both spoke on condition of anonymity because they were not authorized to discuss the ongoing investigation. Two other officials have said they are looking into the possibility of a second shooter at the Navy Yard. LIVE VIDEO --> http://abc7ne.ws/7hbdv