The Britain-based Observatory said the bodies of the FSA's deputy commander for the area and two other rebel officers had been found Friday on the banks of the nearby Euphrates River near Muhassen.
The three had been captured Wednesday by an Islamist brigade allied with the jihadist Islamic State of Iraq and the Levant (ISIL) and their bodies showed signs of having been killed execution style.
Earlier Friday, ISIL, which has a significant presence in the eastern province on the border with Iraq, had seized Muhassen and two other villages in the area.
Elsewhere in Syria, 21 surface-to-surface rockets hit the suburban Damascus town of Mleiha, which controls access to the rebel-held Eastern Ghouta area, the Observatory said.
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The three had been captured Wednesday by an Islamist brigade allied with the jihadist Islamic State of Iraq and the Levant (ISIL) and their bodies showed signs of having been killed execution style.
Earlier Friday, ISIL, which has a significant presence in the eastern province on the border with Iraq, had seized Muhassen and two other villages in the area.
Elsewhere in Syria, 21 surface-to-surface rockets hit the suburban Damascus town of Mleiha, which controls access to the rebel-held Eastern Ghouta area, the Observatory said.
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