ANKARA: The complete lack of transparency from Saudi officials on the investigation into the murder of journalist Jamal Khashoggi is deeply concerning and detrimental to their credibility, an aide to Turkish President Tayyip Erdogan said.

Fahrettin Altun, Erdogans communications director, told Reuters that Saudi authorities must extradite Khashoggis killers as proof of their willingness to serve justice.

He said Turkeys findings on the case were in line with those of the United Nations special rapporteurs inquiry, adding that Ankara was committed to cooperating in a U.N. inquiry into the case.