Washington - The US is looking into whether a toxic chemical was deployed on areas of Syria that are controlled by rebel forces seeking to oust President Bashar Assad.
State department spokesperson Jen Psaki said on Monday the chemical was likely chlorine, if it was used.
She said officials are still trying to determine what happened in the village of Kafr Zita, but that the US takes allegations about chemicals used in combat very seriously.
On Sunday, French President Francois Hollande told Europe 1 radio station that he has "several elements" suggesting recent use of chemical weapons in Syria, but no definitive proof.
Psaki said the US is working with the United Nations and the Organisation for the Prohibition of Chemical Weapons to get more details.