Turkey has told US officials it has audio and video recordings that prove Mr Khashoggi was tortured and killed inside the consulate, The Washington Post reported, citing unidentified US and Turkish officials.
It was not clear that US officials had seen the footage or heard the audio, the newspaper reported, but Turkish officials have described the recordings to them.
Turkey meanwhile said it had accepted Saudi proposals to set up "a jo.int working group" to investigate the case. It was not clear how such a group would function, given that Turkish officials have accused Saudi Arabia of murdering and dismembering Mr Khashoggi.
Hurriyet and Aksam, two pro-government Turkish newspapers, said talks over searching the consulate broke down after Turkish police said they planned to use Luminol, a forensic chemical which lights up vividly on contact with blood, even if the blood has already been swept clean.
A Turkish source told The Telegraph that the Saudis were also resisting a search of the Saudi consul-general’s official residence, which is near the consulate.
Video footage from the day of Mr Khashoggi’s disappearance show that black vans drove from the consulate to the residence, raising suspicions that the journalist’s body might have been transported there.