A defaced poster of Syria's President Bashar al-Assad is seen near garbage containers in Aleppo. (Photo: Shaam News Network/Handout/REUTERS)

The BBC's Ian Pannell reports from Aleppo, Syria, where rebels hold key parts of the city. But better-armed government forces are pounding rebel-held areas. There are fears that both sides are engaging in revenge killings and summary executions.

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