"The victim Jamal Khashoggi's body was dismembered and destroyed following his death by suffocation, again in line with the advance plans", the two-page statement read.
"Contrary to claims made by the Saudi Crown Prince and others, Saudi Arabia hasn't been "reforming", it's been rounding up critics and activists in a brutal human rights crackdown", Allen added.
"We knew Khashoggi's body was dismembered", Aktay added.
Writing that the murder had involved a "lot more than a group of security officials", President Erdogan called for "the puppet masters behind Khashoggi's killing" to be exposed.
Worldwide outcry over the grisly murder of a dissident journalist is not likely to alter USA backing of domineering Saudi Crown Prince Mohammed bin Salman, officials familiar with the matter tell CNN.
Activists from the London-based NGO temporarily erected a mock street sign in front of the diplomatic compound, in the British capital's wealthy Mayfair district, in a symbolic gesture honoring Jamal Khashoggi.
Khashoggi vanished after entering the consulate in Istanbul to pick up paperwork for his upcoming marriage to his Cengiz, who was waiting for him outside.
"We now see that it wasn't just cut up, they got rid of the body by dissolving it", Yasin Aktay, an advisor to Erdogan and official in Turkey's ruling party, told the Hurriyet newspaper on Friday.
"This is another reason we were shocked and saddened by the efforts of certain Saudi officials to cover up Khashoggi's premeditated murder rather than serve the cause of justice", he said.
Turkey is seeking the extradition of 18 suspects detained in Saudi Arabia over the journalist's slaying.
Once an adviser to the Saudi royal family, Khashoggi fell out of favour with the government past year and went into self-imposed exile.
"Rather than share the information he has, the Saudi prosecutor tried to learn what information and evidence Turkey has in its hands", Mr. Selvi wrote Wednesday. Riyadh has maintained that neither King Salman nor Crown Prince Mohammed bin Salman knew of the operation to target Khashoggi.
The crown prince, who has denied any involvement in Khashoggi's disappearance, reportedly described the journalist as a unsafe Islamist shortly after he vanished in a phone call with White House adviser Jared Kushner and national security adviser John Bolton.
The Nov. 2 date was chosen to remember two French journalists who were killed in Mali on this day in 2013 - two of the more than 1,000 journalists whom the United Nations says have died since 2006.
They report that the US government is continuing to support the crown prince, and that "Major figures in [American] finance signaled that they, too, meant to look past the killing".
Pompeo's remarks come after Istanbul's chief prosecutor, Irfan Fidan, gave the most detailed official account of the killing so far on Wednesday.
Saudi officials have offered varying explanations for how and why Khashoggi was killed on October 2.
The Saudi government has said it will carry out a thorough and transparent investigation and that the suspects will be prosecuted in Saudi Arabia.