Heartbreaking 'final messages' from people trapped inside East Aleppo
Fall of Aleppo will be a pivotal moment in Syria war
Bana Alabed, 7, tweeted live along with her mother from East Aleppo. "I am talking to the world now live from East
A journalist shared an Aleppo-based doctor's last message which read, "A farewell message: Remember that there was a city called Aleppo that the world erased from the map and history."
Terrified residents have poured out of rebel-held neighbourhoods as the army advanced since the beginning of an operation on November 15. The Observatory said on Monday that another 10,000 people had fled rebel areas over the previous 24 hours, bringing the total number of those who have fled -- mostly to government-held territory -- to 130,000.
Syria's rebels seized control of east Aleppo in 2012, a year into an uprising that began with anti-government protests but spiralled into a complex multi-front conflict, drawing in proxy powers and militant groups such as the Islamic State.
Here are some of the last messages.