The Organization for the Prohibition of Chemical Weapons has confirmed that insurgents in Syria used sulfur mustard in August, likely killing an infant.

Friday's statement was the first official confirmation that sulfur mustard, often called mustard gas, has been used by insurgents in Syria.

An OPCW source told The Associated Press Thursday that inspectors found evidence of sulfur mustard use by insurgents in the town of Marea on Aug. 21. Friday's statement provided official confirmation.

The international watchdog also said that another mission investigating allegations that toxic chemicals were used as weapons in Syria's civil war found that chlorine likely was used in March this year in fighting in Idlib.

The findings, which do not apportion blame for the chemical attacks, will be sent to the United Nations Security Council.