The announcement today was welcomed by UN humanitarian chief Valerie Amos, and follows a successful but difficult three-day evacuation mission in Homs, where gunfire and attacks have frustrated progress.
"I hope this will allow us to evacuate yet more civilians and deliver much needed additional supplies," said Amos in a statement which reported that more than 800 people have been helped out of Homs since late Friday.
"The protection of civilians caught up in this horrendous conflict in Syria is the greatest priority for UN agencies and humanitarian partners," Amos added.
The humanitarian exit operation is part of a deal brokered by the United Nations between the regime and the Syrian opposition after months of negotiations.
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But a ceasefire permitting the Homs evacuation proved fragile Saturday, with the first aid convoy coming under attack and mortar shells hitting a rebel-held district yesterday, killing five people.
Meanwhile, UN diplomats in New York have resumed the task of trying to persuade Russia to back a new humanitarian resolution.
A draft text of the non-binding resolution, seen by AFP, prepared by Australia, Jordan and Luxembourg "demands that all parties, in particular the Syrian authorities, immediately end the sieges of the Old City of Homs," as well as in Aleppo, Damascus and other cities.