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In 1995, seven years after the Halabja attack, the Japanese cult Aum Shinrikyo managed to produce sarin independently, and deployed it twice - killing 21 people. The first assault occurred late at night in Matsumoto on the island of Honshu, killing eight people. That incident was at the time thought to be an accidental insecticide leak. Nine months later, Aum Shinrikyo again released sarin, in the Tokyo subway.