A group of United Nations weapons inspectors has returned to Syria to continue investigating reports of chemical weapons use there. Their probe will include gathering evidence about an attack on the village of Khan al-Assal near the city of Aleppo on March 19 that reportedly killed dozens. Both the government and Syrian rebels have blamed each other for the attack. A previous report by the inspectors confirmed the nerve agent sarin was used in the deadly attack in Ghouta last month.