WASHINGTON (AP) ? At least two of the three men involved in a possible al-Qaida plot to pull off an attack coinciding with the 10th anniversary of 9/11 are believed to be U.S. citizens or have U.S. traveling documents, government officials said Friday. Their primary mission is to explode a car bomb in either New York or Washington, but if that proves impossible, they have been ordered to simply cause as much destruction as they can, one U.S. official said.