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PEORIA, Ill. - The 37-year-old computer science student was racing against a deadline. Just one day after picking up his visa from the U.S. Embassy in Qatar, he boarded a plane with his wife and five small children. The family flew to Chicago, caught a night's sleep at an airport hotel, then squeezed into a taxi for a 200-mile ride through farm country to Peoria.
That morning in New York, the twin towers were coming down. Within weeks, a string of tips would lead FBI agents to the doorstep of the student, Ali Saleh Kahlah al-Marri. They eventually came to believe that he was al-Qaeda's senior operative in the United States, a sleeper agent who made an unexplained one-day trip to New York City in the summer of 2000 and who was planning a second wave of attacks.
Yet after more than five years of imprisonment, Marri remains a curiously unknown figure. The investigation of his activities has been shrouded in secrecy. The Sept. 11 commission deliberately left his name out of its 567-page report. President Bush named him an enemy combatant in 2003 -- the only foreigner arrested on U.S. soil to be so designated -- but public attention has focused largely on his rights as a wartime captive.
In a commencement speech in May at the Coast Guard Academy, Bush mentioned Marri for the first time, hinting at why investigators have been so intent on learning what he might know about other sleeper agents. The president said the intelligence community believes that among Marri's potential targets were "water reservoirs, the New York Stock Exchange and United States military academies such as this one."
Marri maintained his innocence during interrogation sessions early in his confinement, his lawyers said. The Pentagon, which last year called Marri a "continuing grave danger to the national security," stopped questioning him after the Supreme Court ruled in 2004 that alleged enemy combatants held in the United States have a right to counsel. He remains at a Navy brig in Charleston, S.C., waiting for the outcome of the battle over his status.
Beneath the legal maneuvers are mysteries that Marri has never addressed:
What was behind his travels between Qatar, Saudi Arabia, Afghanistan and the United States? What was the purpose of his computer research on hacking, and on how to buy and mix large quantities of chemicals into deadly hydrogen cyanide gas? Why did he possess more than 1,000 stolen credit card numbers? Does he have a connection to Dhiren Barot, the now-jailed British al-Qaeda leader who plotted to blow up buildings in the United States and England, and who may have inspired last month's attempted car bombings in London and Glasgow?
And was he rushing to the American heartland on Sept. 10, 2001, on orders from Osama bin Laden, or to beat the cutoff date for college enrollment?
Excerpted