This is an open letter from Numerous Sunni Ulemah to Abu Bakr Al-Baghdadi declaring him as Kharji and the actions of this satanic army to be totally against Islam; I was actually amazed to read the hadith of Imam Ali (KAW) from Sunni narrations in the end where Imam has so eloquently described these Khwarij. http://www.lettertobaghdadi.com/ There is an executive Summary but then there is detailed explanation. A mush read for all if I could recommend. You can also Google Letter to Al Baghdadi and get to the subject matter.