GENEVA - UN human rights chief Navi Pillay said on Friday she wanted an independent investigation into an apparent massacre carried out by Syrian opposition forces in the town of Khan al-Assal.
"Based on the analysis by my team to date, we believe armed opposition groups in one incident - documented by a video - executed at least 30 individuals, the majority of whom appeared to be soldiers," she said in a statement issued by her office.
Syrian state media have accused insurgents of killing 123 people, mainly civilians, during a rebel offensive in Aleppo province late last month.
A group calling itself the Supporters of the Islamic Caliphate posted a video on YouTube of around 30 bodies of young men piled up against a wall. It said they were militiamen who had supported President Bashar Assad.
Over 100,000 people have died in Syria's civil war. In the early months of the conflict Assad's forces were blamed for the documented human rights abuses, but the UN Commission of Inquiry on Syria now says both sides have committed atrocities.