UN's Valerie Amos called on Saturday for a cessation of hostilities in a Damascus suburb besieged for months by Syrian army. She said the cessation is vital as to the delivery of food and medical aid to the population.

Some 3,000 people were evacuated last week, but Amos said "the same number or more remain trapped" pointing out that aid workers can not reach people in the town of Moadamiyet al-Sham.

"I call on all parties to agree an immediate pause in hostilities in Moadamiyet to allow humanitarian agencies unhindered access to evacuate the remaining civilians and deliver life-saving treatment and supplies," Amos said.

She emphasized that Moadamiyet al-Sham is not the only town under siege.

"Thousands of families also remain trapped in other locations across Syria, for example in Nubil, Zahra, old Aleppo town, old Homs town and Hassakeh," she said. "How many more children, women and men will needlessly lose their lives? The humanitarian community has stressed time and time again that people must not be denied life-saving help and that the fighting has to stop," Amos said.

Moadamiyet al-Sham is a suburb southwest of the capital.

Many Kurdish cities are suffering an embargo and isolation which prevent aid to reach the population, although international organizations seem less keen to denounce the siege suffered by this area of Syria. Clashes between YPG (People's Defense Units) and al-Qaeda-linked armed gangs are continuing. On Sunday in Efrin at least six members of the Islamist gangs have been killed in clashes.