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3-Methylfentanyl was also reported by Russian media as the identity of the anaesthetic "gas" Kolokol-1 (it may have been an aerosol, of a free base dissolved in halothane) used in the Moscow theater hostage crisis in 2002, in which many hostages died from accidental overdoses of the narcotic.
Furthermore, following the Moscow theater hostage crisis in October 2002, where 129 of 800 hostages were killed by an unknown chemical agent employed by the authorities to incapacitate the hostage-takers, he proposed that similar gas should also be used by German police to fight terrorism.