The evacuation of thousands of refugees from the besieged city of Aleppo has stopped and the status of the operation thrown into doubt, the International Committee of the Red Cross said Friday.
Red Cross staff, Syrian Red Crescent workers and representatives of the World Health Organization have been told to leave eastern Aleppo.
"The evacuations have been halted," Middle East spokesman for the ICRC, Ralph El Hage, told CNN.
"We are hoping the parties reach an agreement so we can move forward with the evacuation."
Syria's state news agency reported that the al Nusra Front had blocked the exit of 1,250 civilians in Aleppo.
SANA said the evacuation stopped because there was a breakdown in the ceasefire when some of the evacuees were transporting weapons and advanced communication devices.
Evacuations won't begin again until government forces receive guarantees that "the terrorist groups" will abide by all the provisions of the agreement, reported SANA, citing "special sources."
he Syrian Observatory for Human Rights offered a different view, saying militant rebels breached the ceasefire to protest delays in evacuating hundreds of people from two Shia enclaves, Al-Foua and Kefreia, in rebel-held Idlib province to the west of Aleppo. The SOHR cited sources inside Al-Foua.