By June 2014 , according to United Nations reports , ISIL had killed hundreds of prisoners of war and over 1,000 civilians . Specific incidents involving the killing of military prisoners including the mass killing of up to 250 Syrian Army soldiers near Tabqa Air base , and killings that took place in Camp Speicher ( 1,095 – 1,700 Iraqi soldiers shot and " thousands " more " missing " ) and the Shaer gas field ( 200 Syrian soldiers shot ) . ISIL was reported to have beheaded about 100 foreign fighters as deserters who tried to leave Raqqa
Camp Speicher
Camp Speicher massacre
Killing of captives by ISIL