BEIRUT: ISIS has executed more than 90 people, a third of them civilians, over the past month in areas of war-torn Syria under its control, an activist group monitoring the war said Sunday.

The Syrian Observatory for Human Rights said 32 civilians were among 91 people executed for "crimes" in the extremist group's self-proclaimed caliphate between July 29 and August 29.

The toll included ISIS members, rebel fighters and forces loyal to President Bashar al-Assad.

Witchcraft, homosexual acts and working with the U.S.-led coalition fighting ISIS in Iraq and Syria are among "crimes" punishable by death for the group.

Since it announced its "caliphate" in June 2014, ISIS has swept across Syria, seizing swathes of land in central Hama and Homs provinces, Deir al-Zor and Hassakeh in the east, and the north's Raqa and Aleppo.

According to the Britain-based Observatory, the latest monthly toll has brought to 3,156 people the number of ISIS executions in Syria since the caliphate was announced.

The number includes 1,841 civilians.

ISIS has become notorious for its gruesome displays of violence, including beheadings, stoning and pushing victims off rooftops.