The death toll from infighting between rival Islamic rebel groups in an eastern Syrian town has risen 68 killed, with some shot after being captured alive, activists said Friday.

The Britain-based Syrian Observatory for Human Rights said battles raged Friday for a second day in the oil-rich Deir el-Zour province near the Iraqi border. It said the fighting concentrated in the village of Haseen after members of the al-Qaida breakaway group known as the Islamic State of Iraq and the Levant were forced out of the nearby town of Bukamal.

Rebels from the Islamic State and fighters of the al-Qaida-linked Nusra Front and other Islamic groups have been fighting each other in the province for weeks over territory previously captured from President Bashar Assad’s forces, including oil fields. […]