I came across this piece of Dutch (sorry) news:
It says that terrorists had plans to attack AMS or still want to do this. Also 2 other places in Holland are being mentioned as targets.
One person, Samir A, was already busted last year. But our government thinks that there is a whole group of young radical Muslims involved.
The police investigated Samir's house and found "ingredients" to make bombs.
I'll try to find an English article. Any more information about this is welcome.
EDIT: Another Dutch article: http://www.nu.nl/news.jsp?n=404093&c=10
[Edited 2004-09-08 17:31:36]
English article with some information about this: http://www.expatica.com/source/site_article.asp?subchannel_id=1&story_id=11407
[Edited 2004-09-08 17:36:10]