9/11, A Decade Later — Perspectives on terrorism from across the Atlantic

Pre 9-11, the security community in Europe assumed that individual terrorists wanted to attack from afar and take part in more than one operation. The danger had been mainly from the Provisional IRA and Basque separatists.

Since the 2011 attacks, however, authorities have confronted threats not just in territories which are the subject of religious or political dispute (Northern Ireland and the France-Spain border), but also in countries existing peacefully, where immigrants or foreign nationals have adopted radical ideologies.
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