Syrian rebel fighters launched a major assault on government-held parts of Aleppo on Sunday in their first major campaign to retake parts of the city that have been claimed by loyalist forces and allies.

War in Syria: army, allies counter-attack to regain Aleppo

Syrian rebel fighters launched a major assault on government-held parts of Aleppo on Sunday in their first major campaign to retake parts of the city that have been claimed by loyalist forces and allies.