The Britain-based Syrian Observatory for Human Rights says the victims of Monday's bombardment of the town of Salqin included five children. The town is 6 kilometers (4 miles) from the border with Turkey.
The Observatory says the death toll is expected to rise because many people were critically wounded. The Local Coordination Committees, another activist group, put the death toll at 30.
Footage posted online by activists shows several mutilated bodies in a pickup truck as a man shouts that his son was killed. The video's authenticity could not be independently verified.