European airports boost security in the aftermath of Brussels attacks
Police have placed barriers in front the Cologne Cathedral. The measure follows reports that militants sought to target Barcelona's Sagrada Familia - another, albeit more modern, icon of ecclesiastical architecture.
Shlomo Shpiro, professor of Political Science at Bar-Ilan University Tel Aviv, speaks to DW about some of the difficulties involved in preventing terrorist attacks such as those in Spain.
Paris, Brussels, Berlin, Manchester and now another attack in Barcelona. European cities have been increasingly targeted by Islamist extremists in recent years.
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