Istanbul - Saudi Arabia agreed to let Turkish authorities search its Istanbul consulate as part of the investigation into the disappearance of journalist Jamal Khashoggi, as his fiancee asked Donald Trump to help uncover what happened to the Riyadh critic.
There has been fierce speculation over what happened to Khashoggi, a Washington Post contributor who wrote for Arab and Western media, after he vanished on October 2 following a visit to the consulate to obtain official documents.
While Riyadh claimed he had left the consulate after his visit, Turkish police said Khashoggi did not emerge from the building.
Government sources said police believe the journalist was killed inside the consulate, claims which Riyadh dismissed as "baseless".
"Saudi authorities said they were open to cooperation and that a search can be conducted at the consulate building," the Turkish foreign ministry spokesman Hami Aksoy said in a statement on Tuesday.
The search will take place as part of the official investigation, which was being conducted "in an intense manner", he said without giving any date.
Khashoggi's fiancee Hatice Cengiz wrote in an opinion piece for The Washington Post that she was "confident in the abilities of Turkish government officials".
But she also implored "President Trump and first lady Melania Trump to help shed light on Jamal's disappearance".
Trump on Monday expressed concern about Khashoggi's case and Secretary of State Mike Pompeo called for a thorough investigation.
Turkish police were looking into two private aircraft which landed at Istanbul's Ataturk airport on October 2 at different times carrying 15 people of interest in the case, as well as the possibility that Khashoggi was kidnapped and taken aboard one of the planes, local media reported.
Previously Saudi Crown Prince Mohammed bin Salman told Bloomberg that Riyadh would allow Turkish officials to search the premises.
- Mystery team of 15 -
Ankara sought permission Sunday for the search after the foreign ministry summoned the Saudi ambassador for a second time, Turkish television reported.
Riyadh's envoy in Ankara was first called to the ministry on Wednesday.
Khashoggi, a former Saudi government adviser, had been living in self-imposed exile in the United States since last year fearing possible arrest.
He has been critical of some policies of the crown prince and Riyadh's intervention in the war in Yemen.
Police also said a team of 15 Saudis were sent to Istanbul and were in the building at the same time as Khashoggi.
Turkish security officials were working to identify the 15 individuals, English-language state broadcaster TRT World reported, adding that Turkish officials believe the Saudis may have taken the consulate's CCTV footage with them when they returned to Riyadh.
According to pro-government daily Sabah, the team arrived in Istanbul on two private planes, one which landed after 03:00 am (0000 GMT) on Tuesday while the second plane landed around 05:00 pm (1400 GMT) after Khashoggi entered the consulate.
The individuals checked into two hotels close to the consulate, the daily said.
Both planes later returned to Riyadh with one stopping in Dubai and the other in Egypt, Sabah reported, adding the police were looking into the possibility that Khashoggi was kidnapped.
The planes belonged to a company based in Saudi Arabia which has links to the state.
Istanbul police experts were analysing vehicles which entered and left the consulate, some of which were then seen on camera on October 2 at the consul-general's residence, 200 metres away, the daily said.
The newspaper also claimed that Turkish employees at the residence were "hastily" told to take a holiday on the day Khashoggi went missing.
- 'Thorough' investigation -
UN rights office spokeswoman, Ravina Shamdasani, on Tuesday echoed calls for "a prompt, impartial and independent investigation of the circumstances of Mr Khashoggi's disappearance and to keep the findings public" in comments to journalists in Geneva.
European Union's foreign policy chief Federica Mogherini told reporters in Lisbon that "we are 100 percent behind the American position. We expect a thorough investigation and total transparency from the Saudi authorities on what happened".
Meanwhile, in London, British Foreign Secretary Jeremy Hunt met the Saudi ambassador on Tuesday to "seek urgent answers", according to a post on Twitter.