President Bashar al-Assad has insisted Syria will comply with a UN resolution under which his regime must turn over its chemical weapons for destruction.
The UN Security Council is to begin talks today on a statement about the humanitarian crisis in Syria which could include a disputed call to allow cross-border missions, diplomats said.
On the ground in Syria, the violence continued, with regime forces launching air raids in the provinces of Homs and Aleppo, and a car bomb exploding in Damascus province.
The team has said it hopes to present a final report on the alleged attacks by late October.
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Earlier this month it submitted an interim report that confirmed the use of the nerve agent sarin in an August 21 attack in the suburbs of Damascus.
The United States threatened military action in response, accusing regime forces of deliberately killing hundreds of civilians with rocket-delivered nerve agents.
Syria denied the allegations but agreed to relinquish its chemical arsenal to head off a strike under a US-Russian deal which was enshrined in a landmark UN resolution.
The road between Damascus airport and the Syrian capital is the scene of frequent fighting, so the inspectors will travel by road from Beirut instead.
"At this point, we have absolutely no reason to doubt the information provided by the Syrian regime," an OPCW official said yesterday.
In his first comments since the UN resolution was passed on Friday, Assad on Sunday told Italy's Rai News 24 his regime "will comply".
The operation to destroy Syria's chemical arsenal will be one of the largest and most dangerous of its kind.