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Possible chemical weapons massacre in Syria

10:55

Incredible, shocking news out of Syria. A possible chemical weapons massacre by the government of President Bashar al-Assad, with casualty estimates ranging from more than one hundred to more than 1200 including scores of children. The latter figure, if confirmed, would amount to one of the greatest war crimes of the past several decades. NBC's Richard Engel and MSNBC Contributor Rula Jebreal join Chris Hayes.