The New York Times has a story that could be right out of a Tom Clancy novel:
a Russian scientist may have sent a virulent strain of smallpox to Iraq. This Aralsk strain of smallpox was most likely the result of Russian biowarfare experimentation that escaped and caused a smallpox outbreak that was susequently covered up by the Soviet government.
This underscores the risk we face from Saddam Hussein. If Hussein were to release such a virus in a major city, millions would die, and there would be no guarantee that it could ever be traced back to Iraq. Given that set of circumstances, it is absolutely critical that Hussein is stopped before such an event can occur.