Iraqi Parliamentary Security and Defense Commission MP, Majid al-Gharawi, stated at an earlier time "the US is trying to expand the time of the war against the ISIL to get guarantees from the Iraqi government to have its bases in Mosul and Anbar provinces."
These are of course just allegations, but worth bringing up none the less.
http://www.globalresearch.ca/iraqi-army-downs-two-british-planes-carrying-weapons-for-isil-terrorists/5433089
http://groundreport.com/is-the-us-supplying-isil-weapons-in-iraq-and-doesnt-even-know-it/
http://english.farsnews.com/newstext.aspx?nn=13931104000575