The Syrian Observatory for Human Rights said the ultra hardline
group killed them mainly through beheadings and shootings.
An Islamic State video showing the burning to death of pilot Muath
al-Kasaesbeh, released on Tuesday, sent shockwaves through Jordan
which is part of the U.S.-led alliance against the group. Islamic
State also published footage last month purporting to show the
killing of two Japanese captives.
Other groups in Syria have killed captives. Al Qaeda's Syria wing
Nusra Front killed six while around 20 others were put to death by
other insurgents or pro-government groups, said the Britain-based
Observatory, which tracks the conflict using sources on the ground.
Four of those killed were women.
Islamic State controls swathes of territory in Syria and Iraq. The
Observatory reported in November that the group had killed 1,432
captives since declaring a caliphate in June.
(Reporting by Sylvia Westall; Editing by Dominic Evans)
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