They offered no specific evidence to back up the account. Earlier Saturday, however, Turkey’s Anadolu news agency said the Istanbul public prosecutor’s office had opened a probe into Khashoggi’s disappearance. Turkish authorities have said that Khashoggi never left the consulate.

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Saudi Arabia had vehemently denied that Khashoggi, who contributed to The Washington Post’s Global Opinions section, was detained after he entered the mission.

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In an interview with Bloomberg News last week, Crown Prince Mohammed bin Salman said Khashoggi had left the consulate shortly after he arrived Tuesday. Saudi officials have yet to provide any evidence for that assertion.

The Saudi consul-general in Istanbul allowed reporters from the Reuters news agency to tour the consulate Saturday, to show that Khashoggi was not inside.

“I would like to confirm that . . . Jamal is not at the consulate nor in the Kingdom of Saudi Arabia, and the consulate and the embassy are working to search for him,” the consul-general, Mohammed al-Otaibi, was quoted as saying.

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Later Saturday, the Saudi Press Agency released a statement saying that an unidentified official at the Saudi Consulate in Istanbul dismissed the reports that Khashoggi had been killed in the consulate.

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“The official strongly denounced these baseless allegations, and expressed doubt that they came from Turkish officials that are informed of the investigation or are authorized to comment on the issue,” the statement says, in part. It goes on to say that a “security delegation of Saudi investigators” arrived in Istanbul on Saturday, and that they were there to assist in investigating Khashoggi’s disappearance.

The United States is aware of The Post report but cannot confirm it, and does not know where Khashoggi is, a senior U.S. official said Saturday. The official spoke on the condition of anonymity because the official was not authorized to discuss the case on the record.

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U.S. officials did not immediately comment on the Turkish conclusions.

The conflicting accounts appeared certain to deepen a rift between Saudi Arabia and Turkey, both regional powers that have competed for influence in the region.

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The killing, if confirmed, would mark a startling escalation of Saudi Arabia’s effort to silence dissent. Under direction from the crown prince, Saudi authorities have carried out hundreds of arrests under the banner of national security, rounding up clerics, business executives and even women’s rights advocates.

“If the reports of Jamal’s murder are true, it is a monstrous and unfathomable act,” Fred Hiatt, the director of The Post’s editorial page, said in a statement. “Jamal was — or, as we hope, is — a committed, courageous journalist. He writes out of a sense of love for his country and deep faith in human dignity and freedom. He is respected in his country, in the Middle East and throughout the world. We have been enormously proud to publish his writings.”

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Khashoggi may have been considered especially dangerous by the Saudi leadership, analysts said. His criticisms of the royal family and its vast powers were delivered from his self-imposed exile in the United States and could not be dismissed as the complaints of a longtime dissident.

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Rather, he has long been a pillar of the Saudi establishment who was close to its ruling circles for decades, had worked as an editor at Saudi news outlets and had been an adviser to a former Saudi intelligence chief.

Khashoggi first visited the consulate on Sept. 28 to obtain a document related to his upcoming wedding, according to his fiancee and friends.

He returned to the consulate Tuesday, at about 1:30 p.m., concerned that he might not be allowed to leave, according to his fiancee, Hatice Cengiz.

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Khashoggi left his phone with her, along with instructions that she should call a member of Turkey’s governing party if he did not emerge. After waiting more than four hours, Cengiz called the police, she said.

Within a day, Turkish officials were saying they had no evidence that Khashoggi had ever left the consulate while Saudi officials were insisting that the journalist had left fairly quickly.

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The episode was made more confounding by the thicket of security cameras around the consulate, monitoring its entrances and perched on the walls of villas nearby. But neither government has released any video.

In Turkey, Khashoggi’s disappearance, and the allegation that his government was responsible, has sparked fears among the many political dissidents from Arab countries who have settled in the country over the past few years and previously felt secure, according to a Saudi dissident living in Istanbul.

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“It’s a new era,” he said.