A double suicide car bombing at the Bab al-Hawa border post between Syria and Turkey on Monday killed at least 16 people, including six rebels, a monitoring group said.

The Syrian Observatory for Human Rights, updating an earlier toll, said 20 people were wounded as one car detonated at a checkpoint just outside the crossing and another inside the post.

Islamist and moderate rebels angered by ISIL's alleged abuses have forced them from Aleppo city but the group has managed to strengthen its grip on the town of Raqa, also in northern Syria.

Rebel groups in the town shelled areas where ISIL fighters were with mortar rounds, the Observatory said.

Further air raids on Monday killed another five people in Daraa, the Observatory added.

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