The recording purportedly features voices in the A and B blocks of the consulate building, which have been identified as being part of the building’s entrance.
The information comes a day after Turkish authorities searched the consulate and the residence of the consul general.
Fingerprints found during the search include those of Salah Muhammad al-Tubaigy, an autopsy expert from Naif Arab University for Security Sciences.
ALSO READ: IGP warns against detaining suspects beyond 48hrs
He is among the 15 men suspected of forming a Saudi hit squad to kill Khashoggi. His fingerprints were found around an electrical socket in the consulate.
None of the men entered Turkey on fake passports, according to sources in the public prosecutor’s office, who say some are thought to have used diplomatic passports.
Sources have also told Al Jazeera that an individual close to Khashoggi is believed to have been relaying information back to Saudi Arabia about the journalist’s actions and whereabouts during the year and a half since he came to Turkey.
Turkish sources have told Al Jazeera that “important samples” were found during searches of two Saudi diplomatic buildings in Istanbul on Wednesday.
Al Jazeera’s Charles Stratford, reporting from Istanbul, said particular attention had been paid to an area of the consulate called the “C-block”.
“It was only open to diplomatic staff. Sources in the last couple of hours have said that they have very strong evidence that Khashoggi was killed inside the C-block of the consulate.
Sources told Al Jazeera that they found fingerprints inside C-block of six of the 15 men accused of forming part of a hit-squad.
Investigators spent more than 12 hours scouring the consulate and consul general’s residence for clues about Khashoggi’s fate.
A group of Turkish crime scene investigators left the Saudi consul general’s residence in Istanbul after examining the premises for more than nine hours.
“Samples” were recovered from the scene, sources in the prosecutor’s office said without elaborating.
“Whether these were samples of DNA or blood samples is unclear. Apparently, according to sources, these were quite convincing in terms of evidence,” Al Jazeera’s Andrew Simmons reported from outside the home in Istanbul.
and then