They included experts on chemicals and toxicology who were reportedly charged with obfuscating the evidence, the official said, confirming a report in Turkey's Sabah newspaper.
The U.S. -Saudi alliance has come under strain in recent weeks following the October 2 kidnapping and murder of Jamal Khashoggi, a U.S. -based Saudi activist who contributed opinion pieces to The Washington Post.
And he said he had sought explanations from senior Saudi officials over the killing, stressing: "We want to see those responsible held accountable".
The wealthy and powerful prince appeared on Fox News "Sunday Morning Futures" to assure the American audience that the monarchy's de facto ruler "will be 100 percent vindicated and exonerated", after the murder of Washington Post journalist Jamal Khashoggi at the Saudi consulate in Istanbul.
Prince Khalid's release comes as the kingdom faces global outrage over the killing of Khashoggi inside its consulate in Istanbul on October 2.
After two weeks of denials that the kingdom had anything to do with the journalist's disappearance, Saudi officials said that he had been killed during a fight with a team of rogue extradition agents, who had been arrested.
Turkish President Recep Tayyip Erdogan said in the Washington Post last week that the order to kill Mr Khashoggi came from the highest level of the Saudi government.
Khashoggi's body has not been recovered and Saudi authorities are conducting an official investigation amid reports that the body was dismembered and dissolved in acid.
"We must reveal the identities of the puppet masters behind Khashoggi's killing", Erdogan said.
Salah Khashoggi was speaking alongside his brother Abdullah to CNN, in their first media interview following their father's killing in the Saudi consulate in Istanbul on October 2.
Turkey's vice president, Fuat Oktay, told state-run Anadolu Agency that such reports need to be investigated.
Sweden meanwhile is planning to ask: "What measures will be taken to improve the respect for the freedom of expression and the safety of journalists in the Kingdom of Saudi Arabia?".
He said King Salman assured him that those involved in Jamal Khashoggi's murder would be brought to justice.
They also rejected the charges that their father was a supporter of the Muslim Brotherhood organization. The State Department on Friday said it would continue to seek a full investigation into what happened to Khashoggi after he entered the Saudi consulate in Istanbul and never came out.