Washington, Apr 14 (AFP) The United States has proof that Syrian leader Bashar al-Assad's regime launched a chemical weapons strike last weekend on the then rebel-held suburb of Douma, State Department spokeswoman Heather Nauert said today.

"I'm not going to say which day we absolutely knew that there was proof. The attack took place on Saturday, we know for a fact that it was a chemical weapon," she told reporters.

"We know that there are only certain countries like Syria that have delivery mechanisms and have those types of weapons." Asked whether she could say that the United States has proof that Assad's regime was behind the strike, Nauert said: "Yes." (AFP) CK

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