Syrian government forces have been making rapid advances into eastern Aleppo, forcing thousands of civilians to flee.
The Syrian army captured Jabal Badro on Sunday, a day after seizing Hanano district, and is making in-roads in other neighbourhoods.
Its aim is to divide the rebel-held east of the city in two.
Some reports said several thousand civilians were trying to escape, to government and other rebel-held areas.
Some 275,000 people are believed to remain in eastern Aleppo, where food and medical supplies have all but run out.