Authorities in Germany fear that hundreds of killings could be linked to a neo-Nazi group.
Officials there are undertaking a re-examination of hundreds of cases of murder and attempted murder over the last twenty years to see if they are linked to far-right extremists.
An Interior Ministry spokesman said they have already completed an initial review of more than 3,300 unsolved cases between 1990 and 2011, looking for signs of any far-right motive.
Two years ago, a plot was uncovered from the self-styled National Socialist Underground in which a series of murders targeted Turkish and Greek immigrants between 2000 and 2007.
At the time, police were looking for a link to organised crime having ruled out extremism.
The group has only one surviving alleged member. She is currently on trial, and is also suspected of carrying out two bombings which injured dozens of people.
The case resulted in an overhaul of some security services, including the criteria used to classify crimes motivated by ideology.
The investigation stretches back to 1990, the year of German reunification. A surge of racist violence followed, particularly in the formerly communist east and poorer parts of the west.
