Commenting on 15 November 2011 . Roewer stated that back at the time " because of numerous operation in process , and of the quantity of papers involved , it is possible that individual clues which should have been recognised were not " . In a letter to Interior Minister Jörg Geibert , Roewer wrote that there had been a " very strong suspicion " ( '' eine " sehr ernste Vermutung " '' ) of irregularities in the local police department as a result of which " information from there to the suspects in question could have passed " ( '' " dass Informationen von dort an die Betroffenen abfließen könnten " '' ) . He thought connections between the terror cell involved and police in Jena could have already prevented an arrest as early as 1998 . In February 2013 Roewer took his argument a little further , stating that his office had opened an investigation against the police . When pressed for more details he said that the files from his time in office had probably been destroyed , however
terror cell involved
National Socialist Underground murders
Helmut Roewer