Have a look at the following topic for an extensive and sometimes out of control discussion about this incident:
Interesting news story you add to it
If the content is true. I have my doubts on it. In my opinion, the article makes too many asumptions to be credible.
When I read the Newsweek article I do not get really convinced of the safety meassures taken by the US. It states that the 2 Saudi's are "bad guys" and have Al Queda links. Why were they not arrested in the Netherlands? The US could simply have asked Dutch authorities to do so. The only thing they had to do is make clear to the Dutch justice that these 2 Saudi brothers are members of a terrorist organization and come up with proof of that. That would have allowed the Dutch to arrest them. In Holland it is not allowed to arrest people when you have no evidence against these persons. Dutch authorities did not have those and thus had to release the two persons. BTW the above is a hypothetical case and assuming it were "terrorists".
It still have doubts about how this incident has been handled. In the end the two persons have NOT been arrested and are free to go. This incident has been handled in a strange way. Maybe this incident is a good lesson for those parties involved that is not possible to win the war on terror by acting individually, but rather through cooperation and sharing information.