"It will say that there was a chemical massacre... There will certainly be indications of the origins of the attack," Fabius told French radio on Thursday.
The inspectors left Syria on August 31 after collecting samples as part of their probe into a August 21 chemical weapons attack in a suburb of the Syrian capital.
The US and its allies have said the regime of Syrian President Bashar al-Assad carried out the attack, while Damascus and its ally Russia have said rebels were responsible.
"Only the regime had the (chemical weapons) stocks, the (firing) vectors and the interest in doing it, so we can draw a conclusion from that," Fabius said.
Commenting on Russian President Vladimir Putin's contention that rebel forces had carried out the attack, Fabius said: "That is not the truth. This is a version the Russians have been putting forward for a long time. Putin is playing his game."


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