The Syrian Observatory for Human Rights said four women and a child were among 16 other civilians wounded in the bombing in Raqa, which has also been the target of air strikes by a US-led coalition.
The regime has this week stepped up air raids on areas across war-torn Syria held by jihadists and other rebel groups.
According to the Britain-based Observatory, which relies on activist and medical sources on the ground, government aircraft have carried out almost 1,600 raids since October 20 killing 396 civilians, including 109 children.