The Berlin police want to continue looking for clues to the bones of colleagues who were murdered during the Nazi era.
Excavations in the Spandau district have been unsuccessful these days, as the police announced on Tuesday.
"But we hope for clues in an even more intensive search in archives," said police spokesman Martin Halweg.
Berlin - Research in archives abroad, for example in the USA or Russia, is also conceivable.
Ultimately, the previous investigations would have led to the fact that the names of the four colleagues who were shot were now available in full and in the correct spelling.
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A memorial plaque on the police building in Spandau to commemorate the murdered police officers should be renewed accordingly, as Halweg said.
Otto Jordan, Reinhold Hofer, Willi Jenoch and Erich Bautz were suspected of being homosexual.
According to the research, they were shot and buried on April 24, 1945.
The Berlin police want to enable the former colleagues to have a dignified burial.
That is why, 76 years later, with the support of the Volksbund Deutscher Kriegsgräberfürsorge (People's Association of German War Graves Commission), around 60 places on the police site in Spandau were searched for the remains.
According to the information, ground radar, magnetic probe, excavator and shovels were in use.
dpa