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Three decades have passed since a deadly sarin gas attack on Tokyo’s subway in Japan shocked the world. Carried out by members of Aum Shinrikyo, a doomsday cult led by its guru Shoko Asahara, the attackers killed 14 people and sickened 5,800 others when they released a deadly nerve agent inside the subway system. The March 20, 1995, tragedy prompted a crackdown on Aum Shinrikyo, but offshoot groups continue to operate and recruit today.