Iran Agrees, Chemical Weapons Use a Red Line in Syria

Accuses rebels of being main culprits

Iran said on Tuesday it regarded the alleged use of chemical weapons in Syria's civil war as a "red line", echoing major adversary the United States but saying Syrian rebels were the main culprit and not the Damascus government.

Last week Washington said it had "varying degrees of confidence" that Syrian government forces had likely used the nerve agent sarin on a small scale against rebels fighting to overthrow President Bashar al-Assad.