WASHINGTON, Feb. 11 (UPI) -- White House and State Department officials Tuesday confirmed the authenticity of an audiotape with Osama bin Laden's voice aired on the al Jazeera network in which the al Qaida leader urges the Iraqi people to engage in martyrdom operations against American "crusaders." On the tape, bin Laden says: "Those who attack your brothers cannot be your friend. Fight with them, even if it means sacrificing your life for defending your brothers. Iraq is not an aggressor, America is." He went on to say, "We hope that our brothers in Iraq will learn from our martyrs...