Suspected Islamic militants fired a rocket into a field next to the U.S. Embassy here Thursday, Afghan authorities said. The blast occurred less than two hours after Defense Secretary Donald H. Rumsfeld left the Afghan capital. There were no reports of injuries in the 6:15 p.m. explosion about 300 yards from the embassy compound, and 100 yards from the headquarters of international peacekeepers in Kabul. Rumsfeld had earlier held talks with President Hamid Karzai at his palace elsewhere in the city. The defense secretary left about 4 p.m. to continue his tour of Central Asia. Full Story