Could be French citizens, but its not exactly hard to get into a country like France and get weapons. Many countries of Continental Europe are flooded with weapons, its not uncommon to see videos in France/Germany where robbers are fully loaded with armour and assault rifles, even that televised poker tournament a few years ago where gas grenades were thrown and men charged in with AK'S and tactical gear and stole half a million Euros. Far too easy to get weapons even in strict countries, Anders Breivik was strapped up with legal weapons in a liberal paradise like Norway, biker wars in the Nordic countries have involved anti tank rockets, grenade attacks, machine guns etc, kind of glad its difficult to source much more than a few pistols or old smgs from the UK streets.