Chemical weapon use 'becoming routine' in Syria's civil war, US envoy to watchdog says

NEWYou can now listen to Fox News articles!

The U.S. envoy to the international chemical weapons watchdog says the use of such toxic arms is "becoming routine in the Syrian civil war."

Rafael Foley was speaking Monday at a closed meeting of the Organization for the Prohibition of Chemical Weapons' Executive Council, which was called to discuss recent findings including that a "non-state actor" likely used the chemical agent sulfur mustard in August during fighting in the Syrian town of Marea.

Foley says Syrian opposition forces were fighting the Islamic State group in the town close to the Turkish border.

The text of Foley's speech Monday was posted on The Hague-based watchdog's website.

French Prime Minister Manuel Valls warned last week that associates of extremists responsible for the Nov. 13 Paris attacks could use chemical and biological weapons.