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.

Firms say digital twins make staff more productive, but are they a potential legal minefield?

It comes as the government continues to consult on whether to ban under-16s from social media in the UK.