At least 20 people, most of them women, have been killed in a car bomb attack in northern Syria, the country's presidency says.

A top South Korean military commander said on Tuesday he trusted President Yoon Suk Yeol to be making a legitimate decision when he declared martial law, but declined to say if the impeached leader gave orders to "drag" lawmakers out of parliament.

No group immediately claimed the blast that occurred next to a vehicle carrying agricultural workers on the outskirts of Manbij.