He vowed to "bring to justice those who are responsible for this heinous crime".
Many countries responded with skepticism to the version of a brawl involving Khashoggi and rogue officials, putting Saudi Arabia on the defensive even as it hosted an investment conference this week that many dignitaries skipped because of the scandal.
Khashoggi was missing since he entered the Saudi consulate in Istanbul on October 2.
A joint Turkish-Saudi team searched the residence of the Consul General as well as the Saudi consulate last week as part of the investigation into the case. According to two intelligence sources, Qahtani ran Khashoggi's killing by giving orders over Skype.
Crown Prince Mohammed bin Salman "strongly said that he had nothing to do with this, this was at a lower level", US President Donald Trump said on Tuesday, adding he had spoken on Monday to the prince and to his father King Salman.
That earlier assertion, in turn, backtracked from an initial statement that Saudi authorities knew nothing about what happened to the columnist for The Washington Post, who vanished after entering the consulate October 2.
While the Saudi prosecutor's office did not say specifically that its investigators reached the same conclusion, the statement seemed created to acknowledge the legitimacy of evidence and allegations from Turkey that Khashoggi's killing was planned.
Donald Trump has described the killing of a Saudi journalist as a botched operation and a "bad original concept" as the USA took its first, careful steps toward punishing the Saudis by moving to revoke the visas of the suspects.
But May defended Britain's lucrative weapons sales to Saudi Arabia, saying United Kingdom arms export licensing conditions "are among the strictest in the world".
Sri Lanka former President Mahinda Rajapakse named as PM
Since then, party rivalries have been simmering within the government. "This is an anti democratic coup", he said in a tweet. Sirisena, who was Rajapaksa's minister of health, broke away from him to contest the presidential elections.
Microsoft enjoys record quarter thanks to Azure and Gaming
Microsoft's pride and joy Intelligent Cloud division continues to beat expectations and produce increased revenue numbers. Azure revenue rose 76 percent over the year, slower than the 89 percent rise in the previous quarter.
Megyn Kelly Negotiating Exit From NBC, ‘Extremely Unlikely’ to Return
" NBC confirmed in a statement Friday that the morning show has been canceled, saying,"'Megyn Kelly Today " is not returning. Others were doubtful she could make the transition from a hard-edged cable news host to the lighter fare of a morning show.
"If these individuals now have visas, those visas will be revoked today", May said, adding that she planned to speak to King Salman later Wednesday.
A new surveillance camera image purports to show a Saudi consular vehicle at Istanbul's Belgrad Forest the night before Washington Post columnist Jamal Khashoggi was killed, evidence Turkish authorities have said points to his premeditated murder. It was not clear what was in the suitcases.
Trump offered his most stinging indictment yet of a Saudi effort to silence a dissident journalist, calling the series of events that led to Khashoggi's death "the worst cover up ever".
"I don't think that the country dared to commit such a crime without USA support", Mr. Rouhani said in remarks to his Cabinet in Tehran, according to Iran's Fars News Agency.
Mr Trump said he would work with the US Congress to determine the US response to the Khashoggi matter.
After the killing, many global business leaders and Western officials pulled out of the forum, including the chief executives of JPMorgan Chase, Uber, Siemens and Blackrock.
But Ankara has been holding its own investigation and Erdogan said the killing was meticulously planned, calling for 18 Saudis detained by Saudi authorities to be tried in Turkey. He was told he would need to return later to collect the documents.
Erdogan's call with the crown prince was the first conversation between the two leaders since Khashoggi's death.