An explosion has hit a bus convoy carrying evacuees near the Syrian city of Aleppo, killing at least 39 people.
The UK-based Syrian Observatory for Human Rights says that the blast was caused by a car bomb.
Thousands of people have been stuck in dozens of buses in two separate convoys on the edge of Aleppo city for more than 30 hours.
They are involved in a population transfer deal but have been stranded since the agreement stalled.
Thousands of people from the pro-government areas of Foua and Kfraya are stuck by the edge of the city.
A short distance away thousands more from the opposition towns of Madaya and Zabadani are also stuck.
One of those stranded is Ahmed Afandar from Madaya who has described the situation as ‘disastrous’.
He said: The people are restless. All these thousands of people are stuck in less than half a kilometre.
We are not moving forward or backward.
Food has been distributed but those on board the buses do not have access to toilets.
The deal to transfer people from both sides stalled when the rebels and government disagreed over the number of gunmen that could be evacuated.