The Assyrian civilian population of upper Mesopotamia ( the Tur Abdin region , the Hakkâri , Van , and Siirt provinces of present-day southeastern Turkey , and the Urmia region of northwestern Iran ) was forcibly relocated Departing and massacred Killing by the Ottoman army , together with other armed and allied Collaboration Muslim peoples , including Kurds , Chechens and Circassians , between 1914 and 1920 , with further attacks Attack on unarmed Bearing_arms fleeing Escaping civilians conducted Action by local Arab militias .