I'd not heard of this incident, but ICSR @ Kings College, London has provided a short commentary and asks:
The wider significance of this incident will become clear once investigators have determined whether Abdirazak had succeeded in joining a foreign terrorist group, received training, and acted on its behalf. If not, this incident might be a further example of the strategy of “lone actor” terrorism, which has been actively promoted by Al Qaeda.
Link:http://icsr.info/2012/12/icsr-insigh...n-bonngermany/