The Britan-based Syrian Observatory for Human Rights said that fighters from the Islamic State group seized the al-Tanak oil field today. Another group, the activist collective of Deir el-Zour, also reported the seizure.
The field is in the eastern Syrian province of Deir el-Zour, near Iraq.
Yesterday, the group seized Syria's largest oil field as it tries to create a corridor from the border town of Boukamal, to the provincial capital of Deir el-Zour.