The leader of al-QaIda's Syrian wing tried unsuccessfully at a recent meeting to convince rival Islamist factions to merge into one unit, several insurgency sources have told Reuters.

Abu Mohamad al-Golani, head of the Nusra Front, even suggested he was willing to change the name of his group if the others, including the powerful Ahrar al-Sham organization, agreed to the deal, the sources said.

But he made clear that Nusra would not cut its ties with al-Qaida, and its allegiance would remain to Ayman al-Zawahri, who took over as leader after U.S. Navy SEALS killed Osama bin Laden in 2011.