Oklahoma City bombing conspirator Terry Nichols says a high-ranking FBI official "apparently" was directing Timothy McVeigh in the plot to blow up a government building and might have changed the original target of the attack, according to a new affidavit filed in U.S. District Court in Utah. The official and other conspirators are being protected by the federal government "in a cover-up to escape its responsibility for the loss of life in Oklahoma," Nichols claims in a Feb. 9 affidavit. Documents that supposedly help back up his allegations have been sealed to protect information in them, such as Social Security...