| The rebel coalition said it would double the number of fighters to retake the whole of Aleppo |
Rebel factions who claim to have
made gains in Syria's city of Aleppo have come under intense air strikes
from pro-government forces.
The rebels earlier said they had broken a weeks-long government siege of Aleppo a claim denied by Damascus. Some 250,000 people reportedly live in the besieged areas.
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An AFP news agency correspondent reported that air strikes had targeted rebel-held areas of Aleppo.
Opposition activists said Russian aircraft also took part in the air strikes on Sunday in Aleppo's Ramouseh area. There was no immediate comment from the Russian military.
Meanwhile, the rebel coalition said it would double the number of fighters to launch a new offensive and retake the whole city.
"We will not rest until we raise the flag of the conquest over Aleppo's citadel," the coalition was quoted as saying.
However, government forces appear to be redeploying to avoid the rebels making any further gains.
Government forces cut Aleppo's rebel-held areas off in July.
Aleppo was once Syria's commercial capital and also boasted a rich architectural and archaeological heritage.
Much of it has been destroyed or looted during more than five years of war.