A car bomb of the militant Islamic State (IS) group on a security checkpoint controlled by Turkey-backed Syrian rebels in a village near Syria's Al-Bab has killed 35 civilians and six rebels, sources in the region said on Friday.

The attack was carried out in Sousian, northwest of Al-Bab and wounded many others, the sources said.

The Turkey-backed rebels on Thursday drove IS from Al-Bab, the jihadist group's last significant stronghold in northwest Syria, along with the two smaller neighbouring towns of Qabasin and Al-Bezah, after weeks of street fighting.