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The rescue helicopter 'Christoph 77' hovers in front of the dome in Mainz, Germany, 28 April 2017. With the campaign 'HELFER sind TABU! - Keine Gewalt gegen Einsatzkraefte!' (lit. 'HELPERS are OFF LIMITS! - No violence against rescue forces!', the rescue services want to call attention to the rising number of incidents in which rescue forces were insulted, impeded or attacked. Photo: Andreas Arnold/dpa /MediaPunch ***FOR USA ONLY***