At least 19 civilians have been killed in a car bomb attack in a northern Syrian town controlled by Turkish-backed rebels, first responders say.

Another 80 people were wounded when the vehicle exploded near a bus station in al-Bab, about 40km (25 miles) north-east of the city of Aleppo.

Rescuers from the White Helmets said they were still searching for survivors amid the rubble of damaged buildings.

It is not known yet who was behind the blast.

However, there have been a number of attacks in al-Bab since it was captured by rebels and Turkish troops from the Islamic State group in 2017.

A car bombing last November that left 18 people dead was blamed by Turkish authorities on the Syrian Kurdish People's Protection Units (YPG) militia, which Ankara considers a terrorist organisation.

(With input from agencies)