In a breaking news alert, the channel said children were among the casualties in "terrorist shelling of the city".
The bombardment was also reported by the Syrian Observatory for Human Rights, a Britain-based monitor, which put the death toll at 13.
The group reported at least 33 people wounded and said the death toll was expected to rise because of the number of seriously wounded.
The Observatory said the rocket fire hit several neighbourhoods in the government-controlled west of Aleppo, and came a day after at least four people were killed in similar rebel fire.
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Government forces regularly pound rebel-held areas from the air, and opposition fighters fire rockets and mortar rounds into the west.
The rebel fire came as Human Rights Watch criticised opposition fighters in a new report for "indiscriminate" attacks against civilians in government-controlled areas.
HRW warned there had been a "race to the bottom in Syria, with rebel groups mimicking the ruthlessness of government forces".
More than 215,000 people have been killed in Syria since an anti-government uprising that began with peaceful demonstrations in March 2011.
IS claimed responsibility yesterday for a double bomb attack on Kurdish new year festivities in the northeastern city of Hasakeh on Friday night.
Today, the Observatory said the toll in that attack had risen from 45 to 54 dead, among them 20 children.