After the 1989 Velvet Revolution , city archivist Vladimír Kaiser started to investigate the event , most recently publishing the results together with Jan Havel , another Ústí citizen , and German historian Otfrid Pustejovsky as '' Stalo se v Ústí nad Labem 31 . července 1945 '' ( Ústí nad Labem 2005 , ; German translation '' Ein Nachkriegs-Verbrechen : Aussig 31 . Juli 1945 '' ; ) . While only indirect evidence survived , they conclude that the explosion and massacre were prepared by Communists within the Czechoslovak secret services , specifically Bedřich Pokorný , leader of Ministry of Interior 's Defensive Intelligence ( '' Obranné zpravodajství '' ) department who earlier organised the Brno death march , in order to support the transfer of Germans from Czechoslovakia by presenting to the Potsdam Conference an argument that further cohabitation of Germans with Czechs was impossible . ( Kaiser 's 2000 hypothesis that the motive was the Western powers ' interest in destroying the new Daimler-Benz DB 605 airplane engines also stored in the dump was found far-fetched and untenable . )
Potsdam Conference
Potsdam Conference
Ústí massacre