"Under the conditions that Turkey and the Al-Nusra terrorist group have found themselves under severe impasse in the Syrian developments, they played the Khan Sheikhoun chemical attack scenario to retrieve their lost reputation," Manif Hamidoush said.
Noting that the Syrian army's advances and victories had created panic and anxiety among the terrorist groups and their supporters, he said that by launching the chemical attack, they wanted to pressure Russia and Iran to change their position on President Bashar al-Assad and the war in Syria.
Syrian opposition claimed last Tuesday forces loyal to President Bashar Assad had used a chemical gas on people in the Northwestern province, killing nearly 80 and injuring 200.
Assad argued his government has no chemical weapons after agreeing to have them destroyed in 2013. He also ruled out having used chemicals against own people.
Iran and many other countries have called for formation of an impartial fact-finding committee to scrutinize the chemical attack and find the culprits behind it.