John Ternus will take over running the technology giant as Cook steps up to become executive chairman.

The firm founded by Amazon billionaire Jeff Bezos is investigating the failed launch.

The Paris prosecutor's office told the BBC it had "taken note of the absence of the people summoned".

The discussion is a sign the AI firm's technology may be too critical for even the US government to do without.

The tech aims to identify people's irises and stop the rise of fake accounts and malicious scams.

The company's claim the AI tool can outperform humans at some hacking and cyber-security tasks has sparked fears in the financial world.