The dissident journalist was dismembered after his murder October 2 in the Saudi consulate in Istanbul but his remains have yet to be found.
Adel al-Jubeir, Saudi minister of state for foreign affairs, said the murder was carried out by Saudi officials "acting outside their scope of authority" and that 11 people have been charged with the crime.
But asked where Khashoggi's body is, he told CBS's "Face the Nation," "We don't know." Jubeir said the public prosecutor responsible for the case had sought evidence from Turkey but had received no response.
Questioned why those in custody couldn't tell them where the body was, Jubeir responded: "We are still investigating."
"We have now a number of possibilities and we're asking them what they did with the body, and I think this investigation is ongoing, and I would expect that eventually we will find the truth," he said.