Some 400 civilians are in urgent need of medical evacuation from Syria's Eastern Ghouta region, including 29 who will die if they are not allowed to leave immediately, the United Nations warned Thursday.

"Around 400 men, women, children... need to be evacuated now," Jan Egeland, head of the UN's humanitarian taskforce for Syria, told reporters in Geneva, adding that 29 of them, including 18 children "will die if they are not evacuated."