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In Shoko Asahara's eight-year trial, he spoke incoherently and never explained the motive for the attacks or acknowledged responsibility. He is seen here in 1989 in Bonn, Germany. Roberto Pfeil/AP hide caption

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Roberto Pfeil/AP

United Nations special envoy to Syria Staffan de Mistura is seen on a video screen as he listens to a Security council meeting on Syria at U.N. headquarters in June about the possible use of sarin gas in an attack that killed more than 90 people. Mary Altaffer/AP hide caption

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Mary Altaffer/AP

Hassan Youssef, a 40-year-old victim of the April 4 chemical attack in Khan Shaykun, receives medical care in a hospital in the nearby Syrian city of Idlib in April. Omar Haj Kadour/AFP/Getty Images hide caption

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Omar Haj Kadour/AFP/Getty Images

Doctors at a hospital in Aleppo, Syria, treat a boy injured in what the government said was a chemical weapons attack on March 19. Syria's government and rebels accused each other of firing a rocket loaded with chemical agents outside of Aleppo. George Ourfalian/Reuters/Landov hide caption

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George Ourfalian/Reuters/Landov

How Doctors Would Know If Syrians Were Hit With Nerve Gas

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