Syrian opposition activists are accusing President Bashar al-Assad of killing at least seven people in a new poison gas attack.
Two shells filled with poison gas were dropped in a rebel-held area of the town of Nabak, northeast of Damacus, the activists told Reuters.
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The Syrian Revolution Coordinators Union also accused Assad's forces of using poison gas.
A US official in Washington told Reuters they had seen the reports, but had no confirmation.
The new accusations came amid a breakthrough in Syria's chemical disarmament.
The Organization for the Prohibition of Chemical Weapons said Friday it had verified the destruction of all of Syria's unfilled munitions.
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Its experts also verified the destruction of parts of buildings at weapons production facilities.
A joint UN-OPCW team hopes to remove the most toxic chemicals from Syria by the end of the year and destroy the entire program by mid-2014.
Opposition groups have accused Assad's forces of using chemical weapons both before and after a nerve gas attack on Aug. 21 that killed hundreds in a rebel-held neighborhood on the edge of Damascus.