Two mass shootings at U.S. military installations in one week, including one in which the perpetrator was a foreign national, have prompted questions over firearm use on American bases.
Friday's shooting by a Saudi national who was in the United States for navy training left three people dead and eight injured at Naval Air Station Pensacola in Florida. It came two days after a sailor shot two civilian Defense Department workers dead at Pearl Harbor Naval Shipyard in Hawaii before killing himself.