French lawyer here, it's difficult to know anything as of now given that's all the information is covered by secrecy as long as he's in preliminary custody.

Neither him nor his lawyers have access to the procedure yet.

This will last for 48 hours from his arrest - it can be 96 hours if they decide his suspected crimes are about drugs or prostitution, and even 144 hours if it's about terrorism.

So we'll probably need to wait for a few days before understanding what this is really about.