Tens of thousands of Afghans are streaming out of major cities and headed toward the borders with Pakistan and Iran amid fears the United States is preparing to unleash a war on the land that has harbored Osama bin Laden. Iran has sealed its border with Afghanistan. Taliban officials of Afghanistan’s ruling Taliban movement have also started to flee the capital Kabul. Yesterday, the Taliban ordered all foreigners out, saying their safety could no longer be guaranteed. Those who couldn’t leave were bracing for war, stocking up on food, as prices soared and the Afghan currency slid. Meanwhile, Mullah Mohammed Omar, the Taliban supreme leader, summoned religious scholars to the capital to discuss waging a jihad, a holy war, against the U.S. Nearly a thousand elders and Islamic scholars from across Afghanistan are expected to attend the meeting tomorrow.