- Any US military action against Syria would amount to "support for al-Qaeda and its affiliates," Damascus has said.
- Syrian Deputy Foreign Minister Faisal Mekdad also told the BBC that armed groups backed by America - not Syrian troops - had used chemical weapons.
- The US says it has evidence that Damascus used the nerve agent sarin in a deadly attack in August.
- President Barack Obama has vowed punitive action but wants Congress to vote on the issue first.
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Syrian Minister: US Strike on Syria 'Would Benefit Al-Qaeda'