Four men were arrested in Germany for allegedly breaking the country's arms embargo against Iran and for export violations. One of the men is a German citizen and three have dual German-Iranian citizenship. The suspects are accused of using front companies in Turkey and Azerbaijan to supply Iran with special valves to be used in heavy water reactors. Prosecutors say that the suspects knew the end-use of the valves. The suspects have been identified as Rudolf M, Kianzad Ka, Gholamali Ka, and Hamid Kh. A fifth suspect has not been named. The arrests were made following searches of homes and businesses in Hamburg, Oldenburg, and Weimar.