The Greek culture ministry said on Friday that it had reached a preliminary agreement with a Belgian collector to acquire a series of photographs that showed the final moments of 200 Greeks before they were executed by a Nazi firing squad during World War II. The pictures were put up for auction a week ago, stirring outrage among many in Greece. The photographs are believed to be the only existing images of a mass execution of communist prisoners that is considered one of the worst atrocities of the Nazi occupation of Greece. The photos show men walking in a double...