Speaking in an interview on Fox News, Jubeir said the Saudi leadership initially believed Khashoggi had left its consulate in Istanbul, where he was last seen on October 2.
But following "reports we were getting from Turkey," Saudi authorities began an investigation, which discovered he was killed in the diplomatic mission.
Saudi Arabia admits Khashoggi died in consulate, fires two senior officials
"We don't know, in terms of details, how. We don't know where the body is," Jubeir said, adding that the Saudi public prosecutor had put out orders to detain 18 individuals, "the first step in a long journey."
He termed the killing a "tremendous mistake" but one which the US-Saudi relationship would eventually overcome.
"The individuals who did this did this outside the scope of their authority. There obviously was a tremendous mistake made, and what compounded the mistake was the attempt to try to cover up," Jubeir told Fox News.
"That is unacceptable in any government. These things unfortunately happen. We want to make sure that those who are responsible are punished and we want to make sure we have procedures in place to prevent it from happening again."
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