This was a horrendous killing spree by the Nazis which gets overlooked. But this was particularly chilling, with most of the victims chosen at random. The story is in Der Spiegel.
In the spring of 1944, Nazi troops massacred hundreds of Italian civilians in the Ardeatine Caves near Rome. After World War II came to an end, however, the German government did little to track down the perpetrators. At the time, both Rome and Bonn were more interested in politics than justice.
[Source: Der Spiegel.]