An Arab coalition airstrike in Yemen has severely damaged a UN compound
Ban's spokesman Farhan Haq said the airstrike happened in the southern city of Aden on Sunday.
"The Secretary-General strongly believes that this incident only underscores the imperative that all the parties to the conflict must end the fighting and return to the negotiation table as the only possible way to achieve a durable peace in Yemen," Haq told reporters.
(Reporting by Michelle Nichols; Editing by Meredith Mazzilli)