The UNRWA chief voiced deep concern over the deteriorating conditions in Yarmouk refugee camp for Palestinian refugees in Syria.

"We remain very worried for refugees and civilians inside Yarmouk. We are very determined to provide assistance to those who have decided temporarily to leave the camp and find shelter elsewhere," said Pierre Krahenbuhl, who heads the UN Agency for Palestinian Refugees UNRWA.

Krahenbuhl said that since the "dramatic changes" brought about by Daesh assault on Yarmouk, "the focus is on how to provide assistance for people inside."

"We are also thinking about how we can we improve the ability for people who wish to leave temporarily to come out safely and to receive assistance," he said.

Krahenbuhl arrived in Damascus on Saturday on an "urgent mission" to discuss aid to civilians fleeing the violence in Yarmouk.

On April 1, Daesh terrorist group an assault on Yarmouk, Syria’s largest refugee camp that lies seven kilometers south of Damascus.