Syria's new government will hold the perpetrators of a "terror attack" that killed at least 20 people in the northern city of Manbij accountable, the Syrian presidency's office said on Monday.

There has been no immediate claim of responsibility for the car bombing in Manbij, located some 30 km (19 miles) from the Turkish border. The attack was the country's deadliest since Bashar al-Assad was toppled from power in December.