(In the name of religion ) Islamic State of Iraq and Syria or Islamic State of Iraq and al-Sham (ISIS) is a Salafi jihadist militant group that follows an Islamic fundamentalist, Wahhabi doctrine of Sunni Islam.
While ISIS calls itself the real executer of Islamic rules, so many other Muslims blame them for diverging from Islamic rules and introducing a brutal Islam. ISIS attracted Jihadis from all around the world, even from non-Islamic countries.
As of December 2015, the group has control over vast landlocked territories in Iraq and Syria with population estimates ranging between 2.8 million and 8 million people, where it enforces Sharia law. A UN report estimated 15,000 fighters from over 80 countries in ISIL's ranks as of November 2014. US intelligence estimated an increase to around 20,000 foreign fighters in February 2015, including 3,400 from Western countries. Killing of captives, military use of children, sexual violence and slavery, beheadings and mass executions, destruction of cultural and religious heritage and use of chemical weapons are some of their most brutal crimes committed during war in Syria and Iraq.