A car bomb killed at least 15 people in the northern Syrian city of Manbij on Monday, the second attack there in three days and Syria's deadliest since Bashar al-Assad was toppled from power in December.

At least 20 people were killed in a car explosion in Syria's Manbij, the deadliest such attack since autocratic President Bashar al-Assad was ousted by Islamist rebels in December last year.

Another car bomb exploded on the outskirts of a city in northern Syria on Monday, killing at least 20 people and leaving over a dozen wounded, officials and emergency responders said. At least 18 women were killed in the bombing,