Lets broaden our outlook;
From another article in todays Globe:
Neither these past incidents nor the recent attacks in Barcelona and Cambrils can be properly understood without the background reality that Islamic extremists are a continued and growing presence in Catalonia, where half of all Spain's Salafist congregations are located. They create a divisively illiberal and coercively influential breeding ground for the praxis of more bellicose young Salafists. Barcelona and Cambrils are not the first places in Catalonia where these violent fundamentalists planned and prepared to carry out an act of terrorism. Barcelona and Cambrils were just the first places in Catalonia where they were successful, even if their initial and probably much deadlier plans had to be unexpectedly replaced.