There are signs the main Syrian opposition council will attend fresh UN peace talks in Geneva later this week.
A member of the council has told the Reuters news agency that there was an “inclination” to attend, although another member has told other reporters a decision is yet to be made.
The attendance of the main opposition is said to be dependent on a drop in the number of violations of a fragile ceasefire in place.
A video uploaded to social media websites on Sunday purported to show rebels from the Jaish al-Tahrir group firing at Kurdish fighters in Aleppo.
Other amateur footage showed a house flattened by shelling in Aleppo.
It was unclear if the video was related to an attack on Sunday on a vegetable market in Aleppo that reportedly killed at least 14 civilians.