Police officers are pictured during celebrations marking the 21st anniversary of Germany reunification in Bonn

 
Police officers are pictured during celebrations marking the 21st anniversary of Germany reunification in Bonn
Police officers are pictured during celebrations marking the 21st anniversary of Germany reunification in Bonn, October 2, 2011. Four suspected Islamic extremists were arrested on suspicion of obtaining guns ahead of events marking the anniversary of German reunification but officials said Sunday they found no weapons or evidence of plans for an attack. REUTERS/Ina Fassbender (GERMANY - Tags: POLITICS)