And this is probably not the last we will see of these attacks.
It is certainly not. Many of us saw this coming a decade or more ago. Immigration without assimilation, of a population of which 1% is radical, is a huge number of radicals. it is impossible to stop all evil actions before they are perpetrated. Things are just getting started. The immigration rate has been ramped up, and the government is seeking to destabilize society so "stronger measures" can be implemented without widespread revolt.