More aid has been sent into the besieged rebel-held Old City of Homs by the UN after hours of talks aimed at saving a truce between warring parties.
UN vehicles towed trailers of food into the city, and aid agencies prepared buses to transport fleeing civilians.
More civilians are set to join the hundreds evacuated out of the Old City since the truce was agreed last Friday.
The current ceasefire deal is due to end late on Wednesday, but the regime has said it will allow an extension.
The BBC's Lyse Doucet, in Homs, says every precaution is being taken with the latest food delivery. Red Crescent vehicles were attacked on their way to the Old City at the weekend, and their workers were briefly trapped.