The London-based Syrian Observatory for Human Rights (SOHR) on Sunday said Daesh executed 91 people in different areas within a month.
The Observatory said that the executions, mostly beheadings, took place between July 29 and August 29.
The terrorist organization executed 32 civilians, including two women, 39 of its own militants, a journalist, eleven fighters from rebel and Islamist factions and at least nine members from the regime forces and allied militiamen, most of them beheaded, the SOHR said in a statement issued on its official site.
Daesh claimed that the executions were carried out for "sorcery, insulting God, sodomy, adultery, banditry, joining and cooperating with the awakening movements, sorcery, cooperating with crusader coalition, mischief on earth and cooperating with the Nusayri regime forces."
The SOHR reported that the number of civilians, rebels, Daesh militants, members of the regime forces and allied militiamen who were executed by Daesh since the declaration of its alleged caliphate in 6/29/2014 has risen to 3156, including 1841 civilians, 76 children and 95 women.
Meanwhile, the number of fighters of YPG, Jabhat al Nusra, rebel and Islamic battalions who were executed after arresting them by Daesh due to the ongoing clashes reached to 236, the SOHR said.
Daesh also executed 182 members of its own militants for "exceeding the limits in religion and spying for foreign countries," it added.