Two Syrian rebel officials and a representative of pro-government forces say a ceasefire deal for Aleppo is back on track, but a unit run by Damascus's Iranian-backed ally Hizbollah denies a deal has been done.
There was also disagreement over who would be included in a parallel evacuation from two towns besieged by rebels.
Abdul Salam Abdul Razak, a military spokesman for the Nour al-Din al Zinki rebel group, told Reuters: "An agreement has been reached and within the coming hours its implementation will begin."
An official in the pro-Damascus military alliance who declined to be named confirmed the truce deal was on, and said some 15,000 people would be evacuated from the villages of Foua and Kefraya, in return for the evacuation from Aleppo of "militants and their families and whoever wants to leave among civilians".
However, Razak said the deal included the evacuation only of the wounded from Foua and Kefraya.