AdvertisementChemical Weapons Used Rarely — But With Deadly EffectAugust 27, 2013Krishnadev CalamurfacebookEmailSubway passengers affected by the sarin gas attack on Tokyo's subway system are carried into St. Luke's International Hospital in Tokyo on March 20, 1995. Thirteen people were killed and more than 6,000 injured in the attack, which was carried out by the Aum Shinrikyo cult. (AP)