Fresh air strikes pounded Syria's Aleppo city early Monday, an AFP correspondent said, as US Secretary of State John Kerry arrived in Geneva in a bid to halt the mounting carnage.
More than a week of fighting in and around Syria's second city has killed hundreds of civilians.
Air strikes on rebel-held east Aleppo hit in the early hours of Monday, AFP's correspondent there said, with no immediate reports of casualties.
Several neighborhoods, including the heavily populated Bustan al-Qasr district, were hit. It was not clear if Monday's raids on the rebel area were conducted by Syrian or Russian jets.
Rebel shelling onto government-controlled western areas of Aleppo city late Sunday killed three civilians including a child, the Syrian Observatory for Human Rights said.
Growing violence in and around Aleppo has left more than 250 civilians dead and threatened both a UN-backed peace process and a fragile ceasefire deal.