A police station by the market was also struck, killing an officer, according to the Britain-based Syrian Observatory for Human Rights, monitoring group that tracks the conflict with the aid of a network of contacts in Syria.
At least 43 civilians have been killed and dozens more wounded in three air strikes on a busy market in al-Atarib, a town in Syria's western Aleppo province.
Videos posted on social media purported to show massive destruction at the scene with rubble from damaged buildings covering the town's street and people's faces drenched in blood.
Three men helped one of those hit in the attack, his face drenched in blood and his features nearly completely obscured. There were at least five children and three women among the dead, it said.
Atareb, in the west of the Aleppo province, is located in an area that part of a "de-escalation zone" agreed under a deal earlier this year between Russia, Iran and Turkey.
The zone mostly covers neighbouring Idlib province, which is largely held by opposition forces and a jihadist group formerly affiliated with Al-Qaeda. Aleppo, Syria's largest city, is controlled by the government.
Though there has been a drop in violence in these zones, clashes have occurred.
The United States and Russian Federation have lately renewed efforts to find a settlement for Syria, where at least 400,000 people have been killed and 11 million displaced in a six-year long civil war.