These guys are mostly European judging by their clothing labels...
John McClane: These guys are mostly European judging by their clothing labels and their... cigarettes. They're well-financed and very slick.
Sergeant Al Powell: Well, now how do you know that?
John McClane: I've seen enough phony ID's in my time to know that the ones they got must have cost a fortune. Add all that up, I don't know what the fuck it means, but you got some bad-ass perpetrators and they're here to stay.
Sergeant Al Powell: I hear ya, partner. And L.A.'s finest are on it.