A Sunni Arab lawmaker was kidnapped by Islamist fighters during clashes with members of his pro-regime tribe in Syria's eastern province of Deir Ezzor, a monitoring group reported Monday.

Fighters from the Ahrar al-Sham rebel group and jihadists from the Al-Qaeda-affiliated Islamic State of Iraq and the Levant (ISIL) abducted MP Mohanna Faisal al-Fayyad on Sunday evening, the Syrian Observatory for Human Rights said.

The abduction, the Britain-based Observatory said, followed two days of clashes between members of Fayyad's tribe, which supports the regime of President Bashar al-Assad, and the rebels groups.

Most of the oil-rich Deir Ezzor province is in rebel hands.