Beirut-based Al-Akhbar daily reported on Thursday that the FSA militants, triggering insurgency in Deir ez-Zor in eastern Syria near Iraqi border, swore to fight along with ISIL terrorists.
The move is considered the last symbolic presence of FSA militants in Deir ez-Zor Governorate, the newspaper noted.
Monir al-Matar, Qanam al-Kurdi, Abu Harun and Abu Abd al-Rahman are the FSA commanders, who accepted to coordinate with the ISIL in Deir ez-Zor, according to Al-Akhbar.
Several supporters of the FSA and the ISIL have censured both groups in Deir ez-Zor for the alliance.
Al-Akhbar quoted a source affiliated to the ISIL as claiming that the coordination comes after ISIL victories in Syria, and there will happen other oath of allegiance soon.
Syria has been gripped by deadly unrest since 2011. According to reports, Western powers and their regional allies - especially Qatar, Saudi Arabia, and Turkey - are supporting the militants operating inside the country.
NTJ/NJF