Airstrikes on Monday killed at least 25 people, mostly civilians, in northwestern Syria in the sixth week of a Russian-led military offensive that has so far killed hundreds of civilians, according to residents and civil rescuers.

They said warplanes flying at high altitude, which monitors said were Russian Sukhoi jets, dropped bombs on the village of Jabala in southern Idlib province, with rescue teams so far pulling out 13 bodies, including women and children.

Russian jets were also behind several raids that hit the town of Khan Sheikhoun, Kfar Batikh and several other villages that left at least another 12 civilians dead, according to another local rescuer.