ISIS massacred Shi'ite prisoners in Mosul after [ telling them they were about to be released ]( http://www.theguardian.com/world/2014/aug/25/isis-ethnic-cleansing-shia-prisoners-iraq-mosul ) . This lie reminds me of the lies Nazis told to Jews to get them to cooperate with being killed. I suspect the purpose of this massacre was to provoke Shi'ite militias to massacre Sunnis and thus force Sunnis to support ISIS.
Ссылка: https://stallman.org/archives/2014-may-aug.html#26_August_2014_%28ISIS_massacres_Shiite_prisoners%29