It is my understanding from briefings that I have had with high-level sources within the intelligence organizations of this country that at least two of the identified terrorists so far were people known to intelligence and immigration agencies.
We had the intelligence data; there just was no system in place to intercept them as they were entering the country or as they were boarding the planes.
Interest in this technology abroad was much higher for airport security because there weren't as many issues related to privacy as in the U.S..