03/15/2012 09:33 pm ET Updated May 15, 2012

Suspect In Afghan Attack 'Snapped,' U.S. Official Says

WASHINGTON -- The American staff sergeant suspected of killing 16 Afghan villagers had been drinking alcohol on the night of the massacre -- a violation of military rules in combat zones -- and suffering from the stress related to his fourth combat tour and tensions with his wife about the deployments, a senior American official said Thursday.

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