Moscow hostage crisis chemical agent

The gaseous chemical agent used to end the Moscow theatre hostage crisis of 2002, causing the deaths of all 40 hostage-takers and 132 of the 912 hostages of many nationalities, has never been identified by Russian authorities, nor has it been conclusively identified by independent science. == Suspected agents == At the time, the agent was surmised to be some sort of surgical anesthetic or chemical weapon.

Source: Wikipedia — Moscow hostage crisis chemical agent (CC BY-SA 4.0)