Plus since the Paris attacks, it is fair to assume that all european intelligence services care about what's happening in Belgium.
It featured a NATO putsch, a CIA-backed fascist network that made it into government (a singularity in Central Europe), NATO, EU, Swift. Plus the Dutroux coverup, exposing the criminality of the government networks. Islamist terrorist networks should be the least of their worries.
a singularity in Central Europe
To be honest, I'd like to cast some doubt on the NATO putsch and the fascist network too, but I have no idea what' you're even talking about. Bende Van Nijvel and Vlaams blok/belang maybe? The Dutroux cover-up is the only thing that might be upgraded to crackpot theory.
There are serious problems with non-integrated muslims here, and they are a serious worry. But terrorism is the smallest part of that, even if delivers the nicest stories for the media.
> According to Meyers Enzyklopädisches Lexikon, Central Europe is a part of Europe composed of Austria, Belgium, [...] as well as northeastern France.
and:
> Nevertheless, [Benelux countries] are occasionally mentioned in the Central European context due to cultural, historical and linguistic ties.
It's needlessly pedantic to pick on this part of the OPs comment when there are bigger issues evident: it just detracts from your main point.