According to the Syrian Observatory for Human Rights, a flurry of airstrikes today against the Idlib Province in northern Syria killed at least 35 civilians today, including an estimated 22 school children, when one of the strikes hit a school.
The Observatory said they weren’t clear if the attacks were carried out by Syrian or Russian warplanes, though later reports from other sources attributed the attacks to the Syrians. The Idlib Province is controlled by the al-Qaeda-linked Nusra Front.
This has made it a regular target for airstrikes, though the comparative lack of intelligence on the location of Nusra fighters means that the attacks have a tendency to hit civilian bystanders. Few Nusra fighters have been caught up in any of the recent strikes.
The main fighting between Nusra and the Syrian military recently is over Aleppo, though there is also considerable tension along the border between Idlib and Latakia Provinces, with the Syrian military having talked up a potential invasion of Idlib from the coast for awhile.
Russia disputes responsibility for this attack on the school at Idlib, saying it is the work of the white helmets (school not hit by airstrikes):
https://www.rt.com/news/364454-russia-idlib-school-comment/