BANJA LUKA (Bosnia and Herzegovina), July 26 (SeeNews) – The postal operator of Bosnia’s Serb Republic, Poste Srpske [BANJ:POST-R-A], said its operating loss widened to 4.67 million marka ($3.47 million/2.39 million euro) in the first half of 2011 from 2.4 million marka a year earlier.