The Syrian Observatory for Human Rights released a recent report on ISIS activities in Syria, saying the group has killed more than 3,000 people in Syria alone, which consists of 1,700 civilians since June 29, 2014.
The UK-based monitoring group has documented 3,027 executions by ISIS in Syria, with 74 of them children.
ISIS has declared a so-called ‘caliphate’ along the borders of Syria and Iraq on June 29, 2014, claiming thousands of lives since then.
The report said 930 people have been executed from Deir Ezzor, and a similar number of victims executed from the Sunni Shaitat tribe as punishment for rebelling against ISIS.
Additionally, some of the dead were from Kobani, a Kurdish town, in which 223 civilians were killed by the militant group.
Alongside killing civilians and opponents, ISIS has frequently executed its own members, accusing them of various crimes, including alleged spying.
ISIS has also killed more than 900 government troops, according to the Syrian Observatory for Human Rights.
The militant group, which frequently draws in many foreign fighters, has managed to seize about one third of Iraq and parts of neighbouring Syria after its bloody insurgency began last year.
An international coalition was formed against ISIS after it declared its so-called caliphate in the region last year, and carried out mass murders which lead to the flee of many ethnic groups who previously lived in the region.
Currently, ISIS holds control over large swaths of territory, stretching eastward from the outskirts of Aleppo city, Syria’s largest, to western Iraq.