Tens of thousands of civilians have fled eastern neighbourhoods of the battered city since President Bashar al-Assad's regime began its latest offensive in mid-November.
Overnight, government troops and allied forces seized the district of Tariq al-Bab where heavy fighting had raged a day earlier, the Syrian Observatory for Human Rights said today.
The government has now recaptured around 60 percent of eastern parts of the city that the rebels overran in mid-2012, according to the Britain-based monitor.
And it has prompted more civilians to flee, heading either further south into remaining rebel-held districts or crossing into government-held territory or areas under Kurdish control.
Assad's forces have made swift gains in east Aleppo, and its loss would be the biggest blow yet to Syria's opposition in the more than five-year-old war.
More than 300,000 people have been killed since the conflict started with anti-government protests in March 2011, and over half the country's population has been displaced.
More than 300 civilians have been killed in the government's assault on east Aleppo since November 15, according to the Observatory.
The monitor says nearly 65 civilians have been killed in the same period by rebel fire on government-held west Aleppo, including nine yesterday.
Rebels have struggled to hold back government ground forces, who have advanced backed by air strikes, barrel bombs and artillery fire.
Yesterday, they rolled back some regime gains in the Sheikh Saeed district on Aleppo's southeastern outskirts, but it was unclear how long they could hold that line.
In preparation for street-by-street fighting in these districts, hundreds of fighters from Syria's elite Republican Guard and Fourth Division arrived in Aleppo yesterday, the Observatory said.
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