The United Nations (UN) team of chemical weapon investigators in Syria left the country after a six-day mission. Led by Swedish scientist Ake Sellström, the UN team is evaluating available information related to all allegations of chemical weapons, for the purpose of preparing its final report before the upcoming Geneva Peace Conference in mid-November.

The team has been investigating allegations into the reported use of chemical weapons of Mar 19 at Khan al-Asal, April 13 incident at Sheikh Maqsud and April 29 incident at Saraqueb.

"The team will now move to the phase of finalizing its report, which the team hopes will be ready by late October," Martin Nesirky, UN spokesperson told reporters in New York.

During their mission the UN investigators also evaluated information on three other chemical weapon use allegations, including the incidents at Bahhariyeh on Aug 22, at Jobar on Aug 24 and at Sahnaya on Aug 25.

The team has earlier found "clear and convincing evidence" that Sarin gas was used in an incident that occurred on 21 August in the Ghouta area on the outskirts of Damascus in which over a thousand people were reportedly killed.

Following the report submitted to the UN, the Security Council passed an unanimous resolution calling upon Syria to eliminate its chemical weapons stockpile within a definite time frame.

The resolution called for the speedy implementation of procedures drawn up by the OPCW "for the expeditious destruction of the Syrian Arab Republic's chemical weapons programme and stringent verification thereof."

The resolution also underscored "that no party in Syria should use, develop, produce, acquire, stockpile, retain, or transfer chemical weapons," adding that defiance of the resolution would lead to measures under the UN Charter's binding Chapter VII, which can include sanctions or stronger coercive action.

The Security Council also endorsed a diplomatic plan for negotiations towards peace. The peace conference to be held in Geneva is expected in mid-November.

More than 100,000 people have been killed since the conflict in Syria began in March 2011, with over 2 million people having fled for safety to neighbouring countries.