ISIS has executed more than 3,500 people in Syria, including nearly 2,000 civilians, since declaring its "caliphate" in June last year, a monitor said Sunday.
In the last month alone ISIS executed 53 people including 35 civilians in areas it controls in Syria, the Syrian Observatory for Human Rights said.
AFP reports that the new figures from the Britain-based Observatory bring to 3,591 the number of people executed by ISIS in Syria since it declared its Islamic "caliphate" after seizing control of large parts of the country.
The new toll includes 1,945 civilians, including 103 women and 77 children, with civilians defined as those who are not taking part in the fighting.
The United Nations has accused it of "crimes against humanity."