Aleppo: How rebels won - then lost - key Syrian city
After controlling the eastern half of Aleppo for four years, rebel groups seeking to overthrow President Bashar al-Assad have lost one of their most important strongholds.
Eastern Aleppo's recapture by government forces came after a long and brutal fight that left much of it in ruins.
Here are some key moments in the battle for the city, as documented by BBC correspondents.