This is a prime example of how not to write a news story. British officials "have learned" and Spanish officials "have confirmed." It doesn't even mention any sourcing whether on the record of off the record.
All the story quotes is this one guy who puts out an English-language paper -- probably a weekly -- with very detailed information about people arrested in Amsterdam who were probably going to New York.
As we all know, if you were a reporter and would call the Homeland Security flack, you'd be met with a flat no comment. I'm also pretty sure that the Dutch police, with all the Muslim problems going on trying to plug the dike, would respond the same. If so, quote the person.
The story may be true, but what upsets me most is that it is an essay and not a news story with the proper sources.