The airstrikes that targeted the town of Manbej in Aleppo province were most likely carried out by Syrian army warplanes, according to the Britain-based Syrian Observatory for Human Rights. It said the death toll was likely to rise because many of the wounded suffered critical injuries.
Twitter and Facebook accounts affiliated with the Islamic State group said 26 people were killed and around 100 others wounded in the attacks.
A US-led coalition also bombs IS targets in Syria on a daily basis, but the two sides say their overflights and strikes are not coordinated.
In Iraq, militants from the Islamic State group blew up a sports stadium in the western Anbar province that in recent months had been used as a military base, officials said today.
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There may have been fighters with the country's Popular Mobilization Forces inside the 30,000-capacity stadium when it was destroyed yesterday, military and security officials in Anbar said, but they were unable to provide a specific estimate and officials with the PMF were not aware of casualties.
The officials spoke anonymously as they are not authorized to brief journalists.
The Iraqi Defense Ministry said last week that security forces were able to "cleanse" the stadium from militants taking refuge inside. It did not elaborate.
The militants seized control of Ramadi in May in what was a major blow to Iraqi security forces on the heels of a victory in Saddam Hussein's hometown of Tikrit.
Iraqi security forces last week announced the launch of a large-scale operation to retake Anbar province from the militants. However, little progress has been reported so far.
The Islamic State group controls about a third of Iraq and Syria, ruling a self-styled "caliphate" where it enforces its radical interpretation of Sunni Islam. It regularly carries out attacks on Iraqi security forces in an effort to destabilize the Shiite-led government in Baghdad.