Investigators are trying to determine what information the watch transmitted.

Axar.az reports: "Intelligence services, the prosecutor's office and a technology team are working on this. Turkey does not have the watch so we are trying to do it through connected devices," he said.

Tech experts say an Apple Watch can provide data such as location and heart rate.

But what investigators can find out depends on the model of watch, whether it was connected to the internet, and whether it is near enough an iPhone to synchronise.

US officials say they are seeking answers from the Saudi Government and are not yet accepting the Turkish Government's conclusions.

Meanwhile, the Washington Post reported that the Turkish Government has told US officials it has audio and video recordings that prove the journalist was killed inside the embassy.

"The voice recording from inside the embassy lays out what happened to Jamal after he entered," one person with knowledge of the recording said, speaking on the condition of anonymity, the Washington Post reported.