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

Hospitals workers say at least 19 people were killed all but one of them women when a car bomb exploded on the outskirts of a northern Syrian city.

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.