ISTANBUL — Turkey said Tuesday that it will search the Saudi Consulate in Istanbul as it investigates why journalist Jamal Khashoggi vanished there a week ago.

Turkish officials fear Khashoggi, a Washington Post contributor, was killed inside the building.

That Saudi Arabia would allow foreigners to enter a consulate and search it shows the growing international pressure the kingdom faces over the writer’s disappearance.

The Saudis have called allegations of any involvement in his disappearance “baseless,” but had no comment on Turkey’s announcement. It remained unclear when the search would take place.

President Donald Trump and European leaders have called on Riyadh to explain what happened to the 59-year-old journalist who has criticized the Saudi government. The kingdom has offered no evidence in the past seven days to show that Khashoggi ever left the building, as a new surveillance photo showed him walking in its main entrance.

“The Saudi Consulate cannot absolve itself of responsibility for this incident by allowing its premises to be searched,” said Gulseren Yoleri of the Human Rights Association. “It has to prove that Jamal wasn’t oppressed at the consulate and that he left safely.”

Secretary of State Mike Pompeo also said U.S. officials have raised the matter with their Saudi counterparts.

“We call on the government of Saudi Arabia to support a thorough investigation of Mr. Khashoggi’s disappearance and to be transparent about the results of that investigation,” Pompeo said in a statement.

Turkish Foreign Ministry spokesman Hami Aksoy said Saudi authorities have notified Ankara that they were “open to cooperation” and would allow the consulate building to be searched. Such a search would be an extraordinary development, as embassies and consulates under the Vienna Convention are technically foreign soil and must be protected by host nations. Saudi Arabia may have agreed to the search in order to appease its Western allies and the international community.

A surveillance image has surfaced, showing Khashoggi entering the consulate Oct. 2. The picture bore a date and time stamp, as well as a Turkish caption saying that Khashoggi was arriving at the consulate. The Post, which first published the photo, said “a person close to the investigation” shared the image with them, without elaborating. The Turkish newspaper Hurriyet also published the image.

The door Khashoggi used appeared to be the main entrance of the consulate in Istanbul’s 4th Levent neighborhood, a leafy, upscale district near the city’s financial hub that’s home to several other consulates. The consulate has other entrances and exits as well, and Saudi officials insist he left through one of them.

The Saudis have offered no surveillance footage or evidence to corroborate their claims that Khashoggi left the consulate, and Turkish authorities have not provided evidence to show why they believe the columnist was killed there.