On April 4, a reported toxic gas attack hit the rebel-held town of Khan Sheikhoun in Syria's Idlib, killing over 80 people and wounding scores of others.
"Our impression is that the West, mainly the United States, is hand-in-glove with the terrorists", Assad said, according to the wire service.
Syrian President Bashar al-Assad has dismissed reports of last week's chemical attack as "100% fabrication", an assertion at odds with numerous eyewitness accounts, independent analysis and even the explanation given by its strongest ally, Russia.
Assad said he would only allow an "impartial" external investigation of last week's suspected chemical attack.
On Wednesday Damascus ally Russian Federation vetoed a U.N. Security Council resolution to condemn the attack and push the Syrian government to cooperate with investigators.
Russian Federation has said it believes poison gas had leaked from a rebel chemical weapons depot struck by Syrian bombs. "Apart from anything else, we believe it's only the regime that has the capability to make such an attack". It said that the airstrike showed that militants have chemical weapons in their possession.
Spokesman Mark Toner also ridiculed the Syrian president s comments to AFP, describing them as "vintage Assad".
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The campaign has come at a cost to the predominantly Kurdish forces, which receive ground and air support from the USA military and other allies.
United Kingdom analysis of samples from the Syria chemical attack has detected sarin or a sarin-like substance, Britain's UN ambassador has said. "We have never used our chemical arsenal in our history".
What makes it hard at times to refute the Syrian government's blanket denials and conspiracy theories is that there are very few truly non-partisan sources of information for outside observers to rely on.
In his first public comments on the April 6 US missile attacks, Assad told the Agence France-Presse news agency in Damascus that neither his troops, nor his government's "firepower" has been affected.
It was the first direct USA military action against Assad s forces since Syria s civil war began six years ago, and led to a quick downward spiral in ties between Washington and Moscow.
Earlier this week, Turkish doctors said tests they had carried out confirmed that sarin gas was used.