At least 12 people have been killed and 30 wounded in rebel fire on government-held districts of Syria's second city Aleppo.
In a breaking news alert, Syrian state television said children were among the casualties in "terrorist shelling of the city" on Monday.
The bombardment was also reported by the Syrian Observatory for Human Rights, a Britain-based monitor, which put the death toll at 13, including five children.
The group reported at least 33 people wounded and said the death toll was expected to rise because of the number of seriously injured.
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.
Once Syria's industrial powerhouse, Aleppo has been ravaged by the conflict, and control of the city is divided between the government-held west and rebel-held east.
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".
Elsewhere, the Observatory said five children from the same family were killed in a government barrel bomb attack on a town in the southern Syrian province of Daraa.
More than 215,000 people have been killed in Syria since an anti-government uprising that began with peaceful demonstrations in March 2011.
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