At least 67 people were killed and more than 185 wounded by a bomb attack in the predominantly Kurdish city of Qamishli, in northern Syria, on July 27.
Medical workers in the city near the border with Turkey said they expect the casualty toll to rise further as more bodies are pulled from the rubble of collapsed buildings.
The Islamic State (IS) militant group claimed responsibility for the attack near the Turkish border.
Local residents say a truck laden with explosives blew up on the western edge of the town, killing and wounding mainly civilians.
Some reports say the blast was followed by a second explosion.
Qamishli resident Suleiman Yussef was quoted by the AP as saying "most of the buildings at the scene of the explosion have been heavily damaged because of the strength of the blast."
IS, which is fighting against the Kurdish YPG militia and its allies in northern Syria, has carried out several bombings in Kurdish areas of Syria in the past.
The July 27 blast was the deadliest bomb blast to hit Qamishli since the country's war began.