A Saturday shooting at a gun outlet in the New Orleans suburb of Metairie, La., has left three people dead and two injured, according to a statement released on Twitter by the Jefferson Parish Sheriff's Office.According to Sheriff Joseph Lopinto, police were dispatched to the Jefferson Gun Outlet in the 6700 block of Airline Drive around 2:30 p.m., where several people had been shot after an argument broke out.Multiple deaths in shooting at...