"WASHINGTON – Islamic websites yesterday posted a "last warning" warning by Rakan Ben Williams, who describes himself as an "al-Qaida undercover soldier" in the U.S., threatening two major operations designed to bring Americans "to your knees." " "The threat suggests the attack will be far greater in magnitude than Sept. 11, 2001, because following this one, "there will be no one to analyze and investigate, because the mind and the heart will be unable to comprehend it. ... This will not be a single operation, but two; one bigger than the other, but we will begin with the big one...