(Agenţia de ştiri FOCUS - 17/05/11; BTA, Sofia News Agency, Dnevnik.bg, Mediapool, Agenţia de ştiri FOCUS, Public Service Europe, Europol, pagina web oficială a Ministerului de Interne din Bulgaria - 16/05/11)
(FOCUS News Agency - 17/05/11; BTA, Sofia News Agency, Dnevnik.bg, Mediapool, FOCUS News Agency, Public Service Europe, Europol, Official Website of the Bulgarian Interior Ministry - 16/05/11)