12 August 2014 :

the Syrian Observatory for Human Rights said the Islamic State of Iraq and the Levant (ISIL) had crucified two people and executed 23 others in the previous five days.
The Observatory and residents in the Governorate of Deir Al Zor in eastern Syria said that fighters from the Al Sheitaat tribe had tried to resist ISIL’s advance.
On 10 August, in Al Shaafa, a town on the banks of the Euphrates river, ISIL beheaded two men from the Al Sheitaat clan, and gave residents a 12-hour deadline to hand over members of the tribe, the Observatory said.
In other parts of Deir Al Zor province, the militants crucified two men for the crime of “dealing with apostates” in the city of Mayadin, and two others for blasphemy in the nearby town of Al Bulel, the Observatory said. The Observatory added that a further 19 men from the Al Sheitaat tribe were executed on 7 August, 18 shot dead and one beheaded, on the outskirts of Deir Al Zor city. It said the men worked at an oil installation. Tribal sources say the conflict between ISIL and the Al Sheitaat tribe, who number about 70,000, flared after ISIL took over of two oil fields in July.