The Local Coordination Committees says two air raids on the village of Janoudiyeh in Idlib province on Monday killed 60 people and wounded others.
The Britain-based Syrian Observatory for Human Rights says the air raid killed 49 people, including six children. It says the death toll could rise as some people are still missing.
Conflicting reports often emerge in the chaotic aftermath of such events.
The Observatory says the air raid struck a public square in Janoudiyeh, near the town of Jisr al-Shughour, which was captured by insurgents in April.
Activist say thousands of people have been killed in government airstrikes since Syria’s conflict began in March 2011.