Lebanese airport officials say a team of U.N. chemical weapons inspectors has arrived in Beirut on its way back to Syria.

U.N officials say the inspectors will complete their investigation into “pending credible allegations” of chemical weapons use in Syria’s civil war.

Lebanese officials, who spoke on condition of anonymity, say the six-member team, led by Swedish expert Ake Sellstrom, will travel by road to Syria later on Wednesday.

A report following the inspectors’ previous trip said nerve agent sarin was used in an August attack near Damascus.

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