Activists say Syrian rebels and fighters from an al-Qaeda-linked group have turned their guns on each other and are fighting for control of a key checkpoint in the northern city of Aleppo.
The Britain-based Syrian Observatory for Human Rights says Saturday's clashes are focused on the strategic checkpoint in Aleppo's Bustan al-Qasr district. The checkpoint is the only gateway between rebel-held eastern districts and the city's western areas, controlled by President Bashar Assad's troops. (AP)