BEIRUT - Islamic State militants have beheaded four tribesmen in eastern Syria after accusing them of fighting against them and receiving military training from pro-government forces, a monitoring organization said.The British-based Syrian Observatory for Human Rights said the men belonged to the Sunni Muslim Sheitaat tribe, which has been battling Islamic State in the eastern Deir al-Zor province bordering Iraq.Islamic State, a radical offshoot of Sunni Muslim group al Qaeda, killed hundreds of members of the tribe in July and August, accusing them of being enemy fighters and apostates, according to residents.The latest killings took place on Sunday in the border town of Albu Kamal, the Observatory said. Two of the men were killed in a public square and the other two at a roundabout in the town.The men were accused of having "fought Islamic State, and joining a camp set up by the regime for the Sheitaat tribe in the Tadmur area," the Observatory said.Tadmur, also known as Palmyra, is in the central Homs province, west of Deir al-Zor.
