Original sentence: Today's nationalist Slovak politicians - especially the members of the Slovak National Party -, even though gendarmes were Slovaks, interpret the event as "Hungarian gendarmes shooting at innocent Slovaks" (during the legal actions after the massacre, some gendarmes refused to be  witnesses, because the victims were their relatives)
Edited sentence: Today's nationalist Slovak politicians - especially the members of the Slovak National Party -, even though all perpetrators were Slovaks, interpret the event as "Hungarian gendarmes shooting at innocent Slovaks" (during the legal actions after the massacre, some gendarmes refused to be  witnesses, because the victims were their relatives)