Rebel fighters have previously fired on the road from both sides. Clashes between the government troops and those of armed opposition are the fiercest in the Sayf ad-Daul district in Aleppo.
Government troops are continuing their mopping-up operation in the liberated districts of Salah ad-Din and Sukkari.
The armed conflict between the armed opposition and the Bashar al-Assad government has been on in Syria since March last year.
Western countries and some Arab states are pressing for al-Assad’s resignation on the assumption that this would end the violence.
Russia and China fear that outside interference in the situation could only serve to further fuel the conflict.