<p>Federal law enforcement officials are investigating to determine whether sleeper cells or freelance agents of Saudi terrorist mastermind Osama bin Laden may have smuggled small, portable nuclear weapons or radiological bombs into the United States.</p>
<p>The deepest concern centers on the chance that bin Laden has acquired and will use a finished nuclear weapon. Rep. Chris Shays, R-Conn., chairman of the House subcommittee on national security, told United Press International: "It's possible, and it's very scary."</p>