First off, condolences to the Belgian people.
Sadly, this incident has once again triggered all the "safety firstest!!!" people. Peter King, et al. are all getting in the news this morning talking about everything from those traitorous people at Apple to, "WE NEED MOAR SURVEILLANCE!!"
Interesting side note, Belgium has basically no privacy protection, and Belgian LE can listen in on anyone's phone conversations any old time, no warrant necessary. I'm sure that was going full force given the recent circumstances there. It didn't stop this attack, yet we have Americans demanding more surveillance and more "safety".
I thought this was the land of the free and the home of the brave, not the land of the safe and the home of the meek.