The Saudi public prosecutor said that the murder of journalist Jamal Khashoggi was premeditated, state TV al-Ekhbariya reported on Thursday.

Saudi Attorney General Saud al-Mojeb said investigators concluded that Khashoggi's killing was a premeditated crime after reviewing evidence presented by Turkish officials as part of a joint investigation, according to a statement on the state-run Saudi Press Agency.

Saudi Arabia initially insisted Khashoggi had walked out of the consulate after visiting the building on October 2. It later dropped that account for a new one, saying it had detained 18 people for what it said was an accidental killing during a "fistfight."

Read more: Saudi crown prince says Khashoggi's killing is 'heinous crime that can't be justified' | CIA director reportedly heard recording of Khashoggi killing during Turkey visit

Many countries responded to the version of a brawl involving Khashoggi with skepticism and demands for transparency. Turkey has been turning up the pressure on Saudi Arabia, a regional rival, to reveal more about the crime.

The seemingly clumsy cover-up of the killing has been exposed to the world with Turkish leaks of information, security camera footage and, eventually, Saudi acknowledgements that Khashoggi died in the consulate. Key mysteries yet to be explained are suspicions that Saudi Arabia's crown prince ordered the killing — even though he publicly condemned it — and the whereabouts of the Washington Post columnist's body.

"Jamal Khashoggi's body still hasn't been found. Where is it?" Turkey's foreign minister, Mevlut Cavusoglu, said Thursday at a news conference with his Palestinian counterpart.

"There is a crime here, but there is also a humanitarian situation. The family wants to know and they want to perform their last duty," Cavusoglu said, referring to hopes for the writer's burial.

Turkish authorities briefed visiting CIA chief Gina Haspel on the investigation into the killing and the evidence they have, a Turkish security official who was not authorized to speak to the media said on condition of anonymity. The official could not confirm whether Haspel had listened to an alleged audio recording of the killing. Pro-government media in Turkey reported officials have such a recording, but its existence has not been confirmed.

On Thursday, conflicting reports surfaced about whether investigators had searched a well in the garden of Saudi Arabia's consulate as part of their probe.

Investigators emptied the well and are awaiting the results of an analysis of the water to determine whether body parts were dumped there, according to Yeni Safak, a pro-government Turkish newspaper. But Sabah, another pro-government newspaper that has published leaks about the case from Turkish officials, said Saudi Arabia has yet to give Turkish authorities permission for a search.

Turkish media have also published a security camera image allegedly showing a vehicle belonging to the Saudi Consulate "scouting" a forest in the outskirts of Istanbul before Khashoggi was killed. The image, obtained by state television TRT and other media on Wednesday, shows a black car with a diplomatic license plate at an entrance to Belgrade Forest.

Turkish President Recep Tayyip Erdogan has said Saudi officials made "reconnaissance" trips to the forest as well as the city of Yalova a day before Khashoggi was killed. Turkish officials have told The Associated Press that investigators were looking into the possibility that the journalist's remains may have been hidden at those two locations.

Energy Minister Khalid Al-Falih said on Thursday that companies that pulled out of the Future Investment Initiative conference in Riyadh had apologised for missing the event.

"All the companies which did not come have been calling us during the past 48 hours, apologising, expressing their regret, and promising to apply to open offices (in the country) during the coming weeks and restore relationships to their norms," Al-Falih told state TV al-Ekhbariya.