Black Flags of Islam Portents of the Imam al-Mahdi, the Moslems' prophesied deliverer of Jerusalem? from Diane Alden… Afghanistan has special significance to the world of militant Islam. It was once called Khurasan, along with parts of Iran and Pakistan. Muhammad said: "If you see the black flags coming from Khurasan, join that army, even if you have to crawl over ice, for that is the army of the Imam al-Mahdi and no one can stop that army until it reaches Jerusalem." That is one reason Osama bin Laden chose it as his base, or al-Qaida. Mohammed's ...