The United Nations is still waiting for security guarantees that will allow the delivery of humanitarian aid to besieged areas of Syria to begin according to an agreement between world powers in Munich.
The process is more "complicated" than expected, Jan Eliasson, Deputy Secretary General of the United Nations, told dpa on the sidelines of the Munich Security Conference.
"We need quick action from their side," he said, adding that aid convoys were ready to go, but it was unclear when security assurances from Damascus would come.
US Secretary of State John Kerry had said that the delivery of aid would commence as early as Monday.
A task force set up by the International Support Group - made up of world powers including the United States, Russia, Iran and Saudi Arabia – met in Geneva Saturday to pave the way for aid deliveries.