The sarin attack earlier this year on the rebel-held town of Khan Sheikhoun that killed more than 80 people was the work of the regime of Syrian President Bashar al-Assad, a joint report from the United Nations and international chemical weapons inspectors finds.

Three UN diplomats confirmed the report's finding.

"The panel is confident that the Syrian Arab Republic is responsible for the release of sarin at Khan Sheikhun on 4 April 2017," the report says, one diplomat told CNN.