Peter Beuth, the state interior minister of Hesse, reported in mid-March that there had been 115 threatening letters attributed to the "NSU 2.0" signature. They had been addressed to 32 people and 60 institutions in nine German states, with the letters also sent to neighboring Austria.
The letters were typically sent by email, but were also delivered by fax and text message.
Open questions after NSU trial
What is the NSU?
The NSU (National Socialist Underground) was a far-right terrorist group in Germany. It was uncovered in 2011 and was responsible for a number of murders and terrorist actions against immigrants and prominent left-wing figures.
The NSU is often associated with three figures hailing from the eastern German city of Jena: Uwe Mundlos, Uwe Böhnhardt and Beate Zschäpe. Mundlos and Böhnhardt killed themselves while on the run from German police in 2011.
The trio had an estimated to 100 to 150 accomplices who assisted them in their criminal activities.