Did I not read in another post with Daily Herald link that the perp(s) fled in a Kia Picanto? If so, there are not likely more than a few hundred of them on the island. The police, Dutch and French, should be able to start from there. I would assume that there are relevant vehicle registration records to work from. I would hope that this would be very high priority investigation, perhaps even some Canadian law enforcement would assist in forensic matters.