The death toll from a Syrian helicopter strike on a rebel-held town near the northern city of Aleppo has risen to 26, activists said on Sunday.
President Bashar al-Assad's forces have been hitting rebel-held areas in the north hard in recent days, according to activists. They say such strikes often precede government offensives.
The Britain-based Syrian Observatory for Human Rights said the aircraft targeted a compound of the rebel group known as the Tawhid Brigade in the town of al-Bab.
The bombs missed their target and hit the Nafasin market instead, killing 26 people, most of them civilians and including four children.
Three of those who died in the attack were rebel fighters, said Rami Abdurrahman, who heads the Observatory.
A government offensive in the north would be the latest push by Assad's forces to recapture territory ahead of peace talks planned for January in Geneva.
The opposition currently holds large swathes of territory in the north, including along the border with Turkey, and districts of Aleppo, Syria's largest city and its commercial center.
The Tawhid Brigade is one of Syria's best known and powerful rebel groups, with an estimated 10,000 fighters. It's particularly strong in Aleppo province.
Assad's troops have also been battling opposition fighters in central Syria's rugged Qalamoun region near the Lebanese border in order to cut off rebel supply routes and stem the flow of fighters from its neighbor.
Also on Sunday, the Observatory said troops fought rebels, including members of the al-Qaeda-linked Jabhat al-Nusra, inside the predominantly Christian town of Maaloula near Damascus.
Heavy clashes were concentrated in the town's old quarter and there were casualties on both sides, Abdurrahman said. He could not provide the number of those killed and wounded in the fighting.
Maaloula lies on the edge of Qalamoun, about 60 kilometers northeast of the capital.