Regime victory comes just hours after rebels reached a cease-fire agreement
The UN warns conditions could deteriorate by next year
Reports say government forces plan to target civilians
Rising ethnic violence raises concerns of a possible widespread conflict
Renewed fighting comes less than a week after ceasefire deal
Investigation blames peacekeepers for failing to act when warring factions attacked aid worker compound
Meet the volunteer group working to save lives in war-torn Aleppo
President Juan Manuel Santos is lauded for his efforts even though peace is not final
U.S.-based group says UN peacekeepers are failing their mission
Amnesty International says attacks killed hundreds, including children
