NEW YORK CITY: A senior UN official pressed the Houthis’ chief negotiator for an independent investigation into the death of a member of UN staff while in the custody of the militia. It comes as the UN steps up its efforts to secure the release of dozens of its employees detained by the Iran-backed group in Yemen. During a visit to Muscat from Nov. 8 to 10, Muin Shreim, who leads the UN’s regional outreach on the arbitrary detention of its personnel, met several senior Omani officials and Moh