Since he began contributing to The Post a year ago, Khashoggi has written on Saudi Arabia's war in Yemen, the kingdom's recent diplomatic spat with Canada and its arrest of women's rights activists after the lifting of a ban on women driving, among other topics. US President Donald Trump has also expressed that he plans to speak with Saudi officials regarding the disappearance.
In the United Arab Emirates on Monday, an influential Emirati official named Ali Rashid al-Nuaimi reportedly told youth gathered for a summit in Abu Dhabi that "our enemies have partnered with media organizations who have reported that the UAE has a prison camp and is committing human rights abuses in Yemen".
In an evening of quick-fire developments, following four days of silence since his disappearance, officials in Ankara pledged to on Sunday release evidence that they say supports claims that the journalist was killed shortly after he entered the consulate to sign divorce papers.
Kurtulmus called the journalist's disappearance a "dire, grisly and scary event".
An unnamed Turkish official told the Reuters news agency over the weekend that Turkish police believed Khashoggi had been killed and his body then removed from the building.
US Vice President Mike Pence also commented on the mystery over the missing journalist, saying "the free world deserves answers". I trust Turkey authorities will unveil details. Associated Press writer Sarah El Deeb in Beirut contributed. "I do not like it", Trump said. "We are fully aligned with the United States on this, with the USA position on this".
The UN rights experts spoke of their concern at Khashoggi's disappearance "and at allegations of state-sponsored murder" of the journalist and government critic. Turkish sources talk about Saudi Arabia's targeting of the journalist, as he was a fierce critic of the regime. "The Saudi officials flew into Istanbul on two different flights on Tuesday", Elshayyal quoted his sources as saying, adding that it was not clear if the Saudi delegation consisted of security or diplomatic officials.
In his newspaper columns, Khashoggi has been critical of some policies of Saudi Crown Prince Mohammed bin Salman and Riyadh's intervention in the war in Yemen.
Hami Aksoy, the foreign ministry spokesman, said in a written statement that the consulate's building will be searched "in the framework of the investigation".
The ministry didn't say when the premises would be searched.
Other western allies increased the pressure on Riyadh which has claimed that Khashoggi had left the Istanbul alive, a claim questioned by Turkish officials.
The building has two entrances at the front and back, and Otaibi said Khashoggi could have left from either side. Khashoggi was writing articles for the Washington Post. Khashoggi disappeared immediately afterward.
The image released on Tuesday bore a date and date stamp.
"Most of their cases have nothing to do with freedom of speech and majority will return to their homes when the process is finished", he said.
"I assure you that the reports that suggest that Jamal Khashoggi went missing in the Consulate in Istanbul or that the Kingdom's authorities have detained him or killed him are absolutely false, and baseless", it notes.