U.S officials believe that the Iraqis have drawn a red line on the map around Baghdad, and once American troops cross it, the Republican Guards are
authorized to use chemical weapons.
Word of the chemical threat came as U.S.- led forces clashed with Iraqís elite fighters for the first time about 50 miles south of Baghdad. U.S.
Apache helicopters fired on the guard to soften them up for ground forces heading north to Baghdad.
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