Islamic State militants attacked Syrian army troops with mustard gas in an offensive against a Syrian military airport in the eastern province of Deir al-Zor that borders Iraq, state media said on late Monday.
Syrian state media did not disclose how many casualties were sustained in the latest drive by the hardline fundamentalist Sunni militants to capture the heavily defended airport located south of Deir al Zor city, whose main neighborhoods are under the militants control.
"The terrorists fired rockets carrying mustard gas," a statement said on state owned Ikhbariyah television station.
Deir al-Zor is a strategic location. The province links Islamic State's de facto capital in Raqqa with its fighters in Iraq.
Reuters could not independently verify the media reports.