From the Times: Saudi officials said Saturday that four men killed in a shootout in downtown Riyadh on Friday were top leaders of the vicious cell of Al Qaeda that beheaded an American hostage hours earlier and that is responsible for most of the often lethal attacks on Westerners in the kingdom. But contrary to earlier accounts, the officials said the body of the hostage, Paul M. Johnson Jr., 49, had not been found, though photographs posted on a Web site left no question that he was dead.