Seven people have been killed in twin bomb blasts that wounded scores on Tuesday in areas of northwest Syria near the Turkish border and under heavy Turkish influence, witnesses and police sources said.

Five people were killed and 20 wounded, some critically, in a blast that exploded at a road junction on the outskirts of the city of al Bab, north of Aleppo province, they said.

A few hours later, at least two civilians was killed and 17 wounded in a car blast in the city of Afrin, a mainly Kurdish area which Turkish forces and their Syrian allies took from the Kurdish YPG militia in 2018.

Videos posted on social media showed footage of mangled cars and extensive damage to an industrial area with fires burning. Reuters could not immediately vouch for their authenticity.

(With input from agencies)