Prosecutors have not disclosed the identity of the second man, the nationality of either suspect, or released any details about their activities while in Turkey.

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The prosecutor’s statement said that Hasan died Sunday in Silivri Prison, outside of Istanbul. He was seen alive at 8:16 a.m., during a morning attendance check, the statement said. At 10:22 a.m., when food was served, a guard found Hasan “hanging on the door of the bathroom of his single-person cell,” the statement said, adding that an autopsy had been conducted.

The murky allegations of state spying and the suspect’s death come as Turkey and the UAE are entangled in a years-long, bitter dispute that has divided and unsettled the states of the Middle East. A fight for influence around the region pits a bloc led by the UAE and Saudi Arabia against Turkey and Qatar, and involves proxy militias, Internet hackers, lobbyists in Western capitals and spies.

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Turkish media outlets said that the two arrested men were suspected of trying to collect information on Palestinian factions in Turkey, as well as on the Islamist Muslim Brotherhood.

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The men’s connection, if any, to the Khashoggi killing was unclear. The journalist and Washington Post contributor, a critic of Saudi Crown Prince Mohammed bin Salman, was killed by Saudi agents in Istanbul on Oct. 2, according to Saudi and Turkish prosecutors. Saudi officials have portrayed the killing as a botched abduction attempt. Turkey says the killing was premeditated and ordered by the highest levels of the Saudi leadership.