Saudi State TV said 18 officials have been identified and detained in connection to the case.
The public prosecutor said Mr Khashoggi died after a fist fight in the consulate.
Saudi Arabia’s King Salman has fired deputy intelligence chief Ahmed Assiri and royal court adviser Saud al-Qahtani over Mr Khashoggi’s death.
Suspects linked to the death of the journalist will be held accountable and brought to justice, Saudi Arabia’s attorney general said.
Mr Khashoggi disappeared earlier this month when he was last seen entering the Saudi consulate in Turkey on October 2.
Turkish officials have since been scouring the nearby area for signs of his remains.
They have searched Belgrad Forest and neighbouring rural city, Yalova, as well as Turkish consulate buildings.
CCTV footage showed Mr Khashoggi entering the consulate as his finance was left outside.
His disappearance brought fierce pressure on Saudi Arabia to explain what had happened and concerns escalated after Turkish authorities said he had been killed in a premeditated murder.
An official said at the time: “We believe that the murder was premeditated and the body was subsequently moved out of the consulate.”
A senior police source told the Middle East Eye the journalist had been “brutally murdered, killed and cut into pieces”.
They said: ”Everything was videotaped to prove the mission had been accomplished and the tape was taken out of the country.”
Mr Khashoggi left Saudi Arabia for Washington in September 2017, just months after Crown Prince Mohammed bin Salman was appointed heir to the throne and became de-facto leader.
Mr Khashoggi was a columnist for the Washington Post and an outspoken critic of the Saudi regime.
Saudi dissident Ali al-Ahmed told Express.co.uk: “This really is the true nature of the Saudi monarchy – it has has been able to hide and cover up this atrocity with the help of its western backers.
“This is the picture – the ISIS-style killing of a man who was their servant, to be honest – he was their mouthpiece for many years.
“He veered away from them and they decided to send a message and commit what was essentially a public execution.”
Source : EXPRESS