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The ISIS group has killed 1,878 people in Syria during the past six months, the majority of them civilians, a British-based Syrian activist group said Sunday, The Daily Star reported.

ISIS also killed 120 of its own members, most of them foreign fighters trying to return home, in the last two months, according to the Syrian Observatory for Human Rights.

The latest summary executions reported by the Observatory and local activists have come in the eastern part of Syria. Video footage of the execution by gunshot at close range emerged over the weekend, purporting to show ISIS militants killing a member of the rival Nusra Front, and a civilian, in the town of Al-Bukamal.

The militant group has taken vast parts of Iraq and Syria and declared a caliphate in territory under its control in June. Since then it has fought the Syrian and Iraqi governments, other insurgents and Kurdish forces.

Rami Abdel-Rahman, the head of the Observatory, told Reuters that ISIS killed 1,175 civilians, including eight women and four children.

He said 930 of the civilians were members of the Sheaitat, a Sunni Muslim tribe from eastern Syria which fought ISIS for control of two oil fields in August.