Elsewhere in Idlib province, Syrian rebels intensified attacks on the last remaining government strongholds, raining shells and mortars on two predominantly Shiite villages and leaving at least 20 dead, the activists said.
A coalition of rebel groups has progressively eroded the presence of President Bashar Assad's forces in the province, taking the city of Idlib and the strategic town of Jisr al-Shughour earlier this year.
The alliance, which calls itself Jaysh al-Fateh, or Conquest Army, is pushing toward the last government strongholds, in the villages of Foua and Kfarya, which are home to mostly Shiite villagers. A large number of civilians are trapped there by the fighting while a nearby military air base remains under government control.
In the airstrike on the city of Idlib, the Observatory said seven people were killed, while the Local Coordination Committees, another group that documents Syria's war casualties, said at least 10 civilians were killed in the bombing.