CAIRO, Egypt - The leader of an al-Qaida umbrella group in Iraq threatened to wage war against Iran unless it stops supporting Shiites in Iraq within two months, according to an audiotape released Sunday. Abu Omar al-Baghdadi, who leads the group Islamic State in Iraq, said his Sunni fighters have been preparing for four years to wage a battle against Shiite-dominated Iran. "We are giving the Persians, and especially the rulers of Iran, a two month period to end all kinds of support for the Iraqi Shiite government and to stop direct and indirect intervention ... otherwise a severe war...