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.

Another car bomb exploded on the outskirts of a city in northern Syria on Monday, killing at least 19 people and leaving over a dozen wounded, hospital workers and emergency responders said. Eighteen women and one man were killed,