PARIS (AFP) - A report by United Nations inspectors probing a chemical weapons attack in Syria will "probably" be published on Monday, French Foreign Minister Laurent Fabius said on Thursday.

"It will say that there was a chemical massacre," he told French radio.

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 United States 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.