Unidentified snipers have opened fire on a convoy of UN experts investigating suspected chemical weapons attacks in Syria's capital, the UN has said.
One car was shot at "multiple times", forcing the convoy to turn back.
Syrian state media blamed opposition "terrorists" for the attack, though the claim could not be verified.
The UN team later resumed its mission, entering the western district of Muadhamiya to gather evidence, before returning to central Damascus.
Hundreds died in alleged attacks on Wednesday in five districts near Damascus.
The US said there was little doubt that Syrian forces used chemical weapons in the attacks, which reportedly killed more than 300 people in rebel-held areas.
Syrian President Bashar al-Assad dismissed the accusation as "an insult to common sense" and warned the US against military intervention.
"If someone is dreaming of making Syria a puppet of the West, then this will not happen," he told the Russian newspaper Izvestiya.