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The Latest on the disappearance of a Saudi writer who Turkish officials fear was killed inside the Saudi Consulate in Istanbul (all times local):

10:10 a.m.

Saudi newspapers have published aggressive front-page headlines, mirroring a statement by the kingdom warning that it won't be threatened amid concerns about the disappearance of journalist Jamal Khashoggi.

The Arabic-language daily Okaz wrote a headline on Monday in English warning: "Don't Test Our Patience." It showed a clenched fist.

The Saudi Gazette trumpeted: "Enough Is Enough."

The Arab News said: "Saudi Arabia 'will not be bullied'."

The Arab News' headline was above a front-page editorial by Dubai-based real-estate tycoon Khalaf al-Habtoor calling on Gulf Arab nations to boycott international firms now backing out of a planned economic summit in Riyadh later this month.

Al-Habtoor wrote: "Together we must prove we will not be bullied or else, mark my words, once they have finished kicking the kingdom, we will be next in line."

___ 7:40 a.m.

Saudi Arabia has threatened to retaliate for any sanctions imposed against it. President Donald Trump says the oil-rich kingdom deserves "severe punishment" if it is responsible for the disappearance and suspected murder of Washington Post contributor Jamal Khashoggi.

The warning from the world's top oil exporter came Sunday after a turbulent day on the Saudi stock exchange, which plunged as much as 7 percent at one point.

The statement was issued as international concern grew over the writer who vanished on a visit to the Saudi Consulate in Istanbul over a week ago. American lawmakers have threatened tough punitive action against the Saudis, and Germany, France and Britain jointly called for a "credible investigation" into Khashoggi's disappearance.