What do the following events all have in common: the Eiffel Tower in France is evacuated for the second time this month over bomb threats; German passport holders are trained in Pakistan for a Mumbai-style terror attack in Germany; British passport holders are trained in Pakistan for a Mumbai-style terror attack in Britain; and a US passport holder from Algeria is arrested in Spain for funneling money to Algerian terrorists. What connects all these events and why are these events even possible to begin with? (That is, of course, a rhetorical question.)