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Undercover police secretly set up a fake company to demonstrate how easily and anonymously a terrorist could purchase chlorine on the Internet for a deadly chemical strike against the city. A videotape -- presented Wednesday at a briefing of private security executives -- discloses for the first time the results of "Operation Green Cloud" -- a reference to the yellow-green color of chlorine gas.
The purpose was "to assess the ease or difficulty with which a terrorist in the United States could acquire large quantities of chlorine without being detected by law enforcement or intelligence agencies," a narrator says on a copy of the video obtained by The Associated Press.