Air strikes carried out by Syrian or Russian warplanes killed more than 20 people in the northwestern city of Idlib on Sunday, monitoring group the Syrian Observatory for Human Rights reported.
Areas hit included a market, and at least five children were among those killed, the British-based Observatory said. It said the death toll was expected to rise because of the number of people seriously wounded.
It said it did not know whether Syrian or Russian jets had carried out the strikes. Both are operating in the area.