More damaging evidence has emerged of the German authorities' failure to stop a group of neo-Nazi terrorists who killed 10 people, robbed 14 banks and planted two nail bombs during 13 years on the run. On Tuesday, the Hessen branch of the domestic intelligence service, the Verfassungsschutz, or BfV, admitted that one of its agents had been present in April 2006 when two members of the National Soc