At least 24 people, including five children, were killed by government air strikes and rocket fire on Douma, a rebel-held suburb some 10 kilometres northeast of the centre of Damascus, the Syrian Observatory for Human Rights said.
An AFP photographer saw wounded children being brought into a makeshift medical centre in the town after the yesterday afternoon bombardment.
A man tried to comfort a weeping boy lying on a stretcher with gauze on his head, while nearby a small girl cried as she waited for treatment, her face spattered with blood.
A witness told AFP that two rockets struck the garden between 10:30 pm (1930 GMT) and 11:00 pm, and that he saw dead and wounded people.
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The Observatory said nine people were killed. State media said they included five women.
"They gave us a present for Ramadan," a resident said sarcastically, referring to the Muslim fasting month that begins on Thursday.
In northern Syria, the Observatory said four children were among seven civilians killed in renewed rebel rocket fire on government-held areas of second city Aleppo on Tuesday.
Control of Aleppo is divided between rebels in the east and forces loyal to President Bashar al-Assad in the west.
In southern Syria, the Observatory said 14 children were among 18 people killed in government air strikes on the rebel-held town of Eastern Ghariyah in Daraa province yesterday.
"The children were killed while at a centre for the study of the Koran," the Observatory said.