The Organisation for the Prohibition of Chemical Weapons in The Hague says Syria has submitted details of its stockpile.
Syria is believed to have about 1000 tonnes of chemical toxins and has agreed to destroy them.
A United Nations diplomat has confirmed the details have been submitted to the agency and are being translated.
Russia and the United States last weekend gave Syria a deadline of Saturday to supply a full list of its chemical arms.
The OPCW said on Friday it expected more details from Syria in the coming days and has postponed a meeting planned for Sunday.
The United States earlier threatened military action over the use of chemical weapons in Damascus on 21 August, but President Bashar al-Assad has blamed rebel groups.
On Monday, the UN confirmed in a report that the nerve agent sarin was used in a rocket attack in Ghouta, although it did not apportion blame.
The BBC reports that once the OPCW agrees to a plan for an initial assessment and overseeing the destruction of certain equipment in Syria, the UN Security Council will seek to endorse it.
However, the five permanent members are still discussing the wording of a resolution, with Russia opposing threats of force against Syria.
