Syria's main opposition group has demanded a full international investigation into an alleged chemical weapons attack in the country's north.
The Syrian National Coalition has also asked for an international delegation to be sent to the site of the missile attack in the village of Khan al-Assal in Aleppo province.
The call by the coalition comes a day after Syria's government and rebels traded accusations about the attack. If it is confirmed, it would be the first time a chemical weapon was used in Syria's two-year-long crisis.
Washington said there was no evidence a chemical attack had taken place.
Syria's state-run Al-Baath newspaper said that countries backing the rebels are indirectly responsible for the attack. The report said the use of such weapons changes "the rules of the conflict."