Syria's army and rebels clashed on Friday in southern Aleppo. It is part of a pro-government offensive to retake Syria's once largest city.

The fighting was concentrated in Sheikh Saeed, a rebel-held district of the city. A Syrian military source said on Friday morning that the army had captured several important positions on Sheikh Saeed's hilltop.

But rebels said later that all those gains had been reversed and insurgents still held the area. Since the start of an offensive two weeks ago, the army has made some progress in northern and central districts of rebel-held eastern Aleppo.