Crimes against humanity include murder, enslavement, imprisonment, torture, sexual violence, persecution “or any other inhumane act” against a civilian population or identifiable group.

Vehicles were central to the ISIS campaign, but like any trucks, they broke down, and mechanics were needed to keep them on the road — mechanics like Boutros Massroua.

War crimes investigators collecting evidence of the Islamic State group's elaborate operation to kidnap thousands of women as sex slaves say they have a case to try IS leaders with crimes against humanity but cannot get the global backing.