A member of the team allegedly sent to kill Saudi journalist Jamal Khashoggi, was recorded saying on a phone to "tell your boss" that the mission had been carried out, the New York Times reports.
The call occurred shortly after Khashoggi was killed last month at the Saudi Consulate in Istanbul.
The 'boss' is believed to be a reference to Crown Prince Mohammed bin Salman, according to New York Times sources "familiar with a recording of Khashoggi's killing collected by Turkish intelligence".
The newspaper says the recording is "seen by intelligence officials as some of the strongest evidence linking Prince Mohammed to the killing of Mr Khashoggi".
Maher Abdulaziz Mutreb, a security officer, made the call. He said words to the effect of "the deed was done".