Saudi officials invited Turkish experts and related officials to visit its consulate in Istanbul, Turkey's state-owned news agency Anadolu said on Tuesday, following the disappearance of Saudi journalist Jamal Khashoggi a week ago.
Turkey's Foreign Ministry said a search would be conducted there, while the United Nations human rights office urged both countries to investigate Khashoggi's disappearance.
Khashoggi entered the consulate last Tuesday and has not been heard of or seen since.
Turkish Foreign Ministry spokesman Hami Aksoy said the investigation was "continuing intensively", and that the Vienna Convention allowed for consulates to be searched by the authorities of the host country with the consent of the mission chief.
"The consulate building will be searched in the framework of the investigation," Aksoy said in a written statement.
"We call for cooperation between Turkey and Saudi Arabia to conduct a prompt and impartial investigation into the circumstances of Mr Khashoggi's disappearance and to make the findings public," U.N. human rights spokeswoman Ravina Shamdasani told a Geneva news briefing.
The two countries have such an obligation under both criminal law and international human rights law, she said.
Khashoggi was previously a prominent newspaper editor in Saudi Arabia and an adviser to a former head of intelligence.