The police sought to search the well as part of the investigation into the murder of Saudi dissident journalist and Washington Post contributor Jamal Khashoggi, who disappeared on Oct. 2 after entering the Saudi consulate.
Authorities have previously carried out inspections at the consulate and consul general's residence in Istanbul as part of the investigation.
Saudi officials initially said they did not know what had happened to Khashoggi, but after weeks of denial confirmed he died in a "fistfight" in the building.
President Recep Tayyip Erdoğan on Tuesday said there was strong evidence that Khashoggi's murder was planned.
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