The Britain-based Syrian Observatory for Human Rights said Tuesday that the airstrikes had killed 15 people, including two children, in the rebel-held Shaar district.
On Sunday, 76 people, including 28 children, died in air raids, opposition groups said. The city was hit by another round of airstrikes on Monday.
Ban told reporters in New York on Monday that the situation in Syria has “deteriorated beyond all imagination” and insisted that the fighting stop before political dialogue on Syria can start.
Brokered by Russia and the United States, peace talks between the Syrian opposition and Assad's government are scheduled to begin in January in the Swiss city of Montreux.
Plans are under way to organize a one-day meeting of foreign ministers in the city ahead of the Syrian talks, U.N. officials said Tuesday.
