The jihadist Islamic State of Iraq and the Levant (ISIL) carried out "mass executions" in Syria in January, the United Nations said Tuesday, adding that it was investigating allegations of mass graves. The group "conducted mass executions of detainees, thereby perpetrating war crimes," the UN Commission of Inquiry on Syria said in an update on the human rights situation in the country. ISIL is a group of radical jihadists who have fought Syria's regime but who since the beginning of the year have also been increasingly battling a coalition of moderate and Islamist rebels angered by their abuses of rival fighters and civilians. In **rthern and **rtheastern gover**rates, ISIL fighters "are imposing their radical ideologies on the civilian population," Paulo Sergio Pinheiro, head of the commission, told the UN Human Rights Council.