Intense infighting between the al - Nusra Front and the ISIS terrorists in al - Qalamoun region in Damascus countryside resulted in several fatalities on both sides. At least 10 Al-Nusra Front and 8 ISIS terrorists were killed in tough infighting in Jaroud al-Jarajir area in al-Qalamoun region on Monday. In a relevant development on Sunday, Field sources in Damascus province revealed intense infighting between the al-Nusra Front and ISIS terrorists in al-Qalamoun region resulted in death of a senior ISIS commander. Abu Azam, an ISIS field commander, and his men were killed in Jaroud al-Jarajir area in Al-Qalamoun. The al-Nusra Front captured several ISIS-controlled military positions in these clashes. Almost the entire range of extremist and terrorist groups are supported by Saudi Arabia and Turkey, with their key commanders and leaders being Saudi nationals. ISIS, Al-Nusra and other extremist groups pursue the same line of ideology exercised and promoted by Saudi Arabia, Wahhabism. Hundreds of Saudi clerics are among the ranks of ISIS and Al-Nusra to mentor the militants. Wahhabism is now the only source of the textbooks taught at schools in the self-declared capital of the ISIS terrorist group, Raqqa, in Northeastern Syria resembling the texts and lessons taught to schoolgoers in Saudi Arabia. The Wahhabi ideology, an extremist version of Sunni Islam that is promoted almost only in Saudi Arabia, sees all other faiths - from other interpretations of Sunni Islam to Shiism, Christianity and Judaism - as blasphemy, meaning that their followers should be decapitated as nonbelievers; FNA reported.