At least 43 people have been killed in a car bomb blast in the rebel-held Syrian town of Azaz, near the Turkish border, reports say.
The explosion occurred outside a courthouse in the town, some just 7km (four miles) from the Turkish frontier.
Azaz has recently been targeted by so-called Islamic State (IS).
The latest blast is the worst since a nationwide ceasefire - brokered by Russia and Turkey. IS is not included in the truce, which has mainly held.
No group has yet said it carried out the bombing, which according to some reports may have killed as many as 60 people and injured many more.
The activist group Syrian Observatory for Human Rights said six rebels were among the dead, with the rest believed to be civilians