Also, what do you mean by known passports? They were using fake passports (that were based on unrelated parties).
Not easy, but it's interesting they were so easily "identified". Technology, I guess, probably scan the videos for facial features, but I'd think intelligence agencies would be ahead of that. Why wear the same disguise, if there was one, to the airport, shopping centers and the hotel.
Also, what do you mean by known passports?
Actual identities. That struck me as odd, but I've been told is relatively common in these circumstances.