A medical worker at a Damascus hospital holds a sign protesting a suspected chemical weapons attack outside the Syrian capital a year ago. The suspected attacks led the U.S. to fire a barrage of missiles at a Syrian air base on April 7, 2017.

A medical worker at a Damascus hospital holds a sign protesting a suspected chemical weapons attack outside the Syrian capital a year ago. The suspected attacks led the U.S. to fire a barrage of missiles at a Syrian air base on April 7, 2017.

A medical worker at a Damascus hospital holds a sign protesting a suspected chemical weapons attack outside the Syrian capital a year ago. The suspected attacks led the U.S. to fire a barrage of missiles at a Syrian air base on April 7, 2017.

Credit: SAMEER AL-DOUMY/AFP/Getty Images

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From the article: 5 Questions About Syria And Chemical Weapons

A medical worker at a Damascus hospital holds a sign protesting a suspected chemical weapons attack outside the Syrian capital a year ago. The suspected attacks led the U.S. to fire a barrage of missiles at a Syrian air base on April 7, 2017.