A Port Security boat in the 'Gota Alv' river near the 'Roda Sten' art exhibition in Goteborg, Sweden, Sunday Sept. 11, 2011. Swedish police arrested four people on suspicion of preparing a terror ... more 
A Port Security boat in the 'Gota Alv' river near the 'Roda Sten' art exhibition in Goteborg, Sweden, Sunday Sept. 11, 2011. Swedish police arrested four people on suspicion of preparing a terror attack and evacuated an arts center in Sweden's second largest city on the eve of the 9/11 anniversary, officials said Sunday. (AP Photo / Adam Ihse / SCANPIX) SWEDEN OUT less 
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Associated Press
Sun, Sep 11, 2011 12:11 PM EDT