Iran's new Supreme Leader, Ayatollah Mojtaba Khamenei, has called on Gulf states to "shut down US bases" and declared the closure of a key oil transit point should be used as leverage, in his first public comments since replacing his father.The statement, read on television by a news anchor, came hours after all but the most essential Australian officials were directed to leave the United Arab Emirates and Israel due to worsening safety fears over the war in the Middle