It's reported that up to 100 people have died in a blast near the Syrian city of Aleppo.
An explosion hit a bus convoy carrying evacuees near the Syrian city of Aleppo.
Pro-Syrian government media in Damascus claims it was caused by a suicide attacker detonating a car bomb.
The blast hit buses carrying residents of two Shia villages who'd been evacuated from towns in northern Syria, besieged by rebels.
Thousands of people have been stuck in buses on the edge of Aleppo.
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.
— Charles Lister (@Charles_Lister) April 15, 2017
They are involved in a population transfer deal but have been stranded since the agreement stalled.
Rebels and the government disagreed over the number of gunmen that could be evacuated.