The senior lieutenant to Saddam Hussein who was detained in Iraq last week obtained passports from Belarus for himself and others, possibly including Saddam's sons, two U.S. government officials said yesterday. The lieutenant, Abid Hamid Mahmud al-Tikriti, is suspected by U.S. officials of having obtained the passports in Syria, where, he told U.S. interrogators, he spent time, after the war, with Saddam's sons, Oday and Qusay, before being expelled by Syrian authorities.