UN officials in Geneva say Sellstrom's team will return to complete its investigation into "pending credible allegations" of chemical weapons use in the civil-war struck Arab state.
In the statement Tuesday, the UN said the investigation will include gathering evidence from an alleged chemical weapons attack on March 19 on the village of Khan al Assal outside the city of Aleppo, which was captured by the rebels in July.
On its previous trip to the country, the team compiled a report that said nerve agent sarin was used in an August 21 attack near Damascus.
Want to enjoy 'Zen' reading - with no ads and just the article? Subscribe todaySubscribe now