The Britain-based Observatory also reported that at least 28 people have been killed in Adra, northeast of Damascus, since rebels launched an offensive there Wednesday.
"Fifteen people, including six men, an 18-year-old and eight children were killed in an aerial bombardment of the Ard al-Hamra neighbourhood" of Aleppo, it said.
The Aleppo Media Centre, an activist network on the ground, reported several helicopter attacks on rebel areas of the city, once Syria's economic hub.
Also in Aleppo, the Syrian Red Crescent yesterday delivered food and medicine to the central prison, which has been under rebel siege for eight months.
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The volunteers escorted out 15 prisoners, said the Observatory, adding that "another 341 detainees are waiting to be released."
President Bashar al-Assad's regime earlier this week announced an amnesty for scores of detainees at the jail "because of the poor health and humanitarian conditions," according to the Observatory.
Meanwhile, northeast of Damascus, at least 28 civilian members of minority religious communities have been confirmed dead in Adra since Wednesday, when Islamist rebels launched an offensive aimed at capturing the key entrance into the capital.
The army has vowed to "crush" Islamist rebels in the industrial town, which has seen fierce fighting for five days.
Most of the country's Alawites -- whose religion is an offshoot of Shiite Islam -- support co-religionist Assad, and many members of other minority groups fear a Sunni Islamist victory in the Syrian conflict.
More than 126,000 people have been killed in Syria since March 2011, and millions more have fled their homes.