The shooting dead of nine people in shisha bars in Hanau is being treated by German investigators as an act of far-right terrorism.
The attack has shocked Germany and added to fears that police may still be missing vital clues about violent racists and their networks, despite previous far-right outrages.
The ability of violent racists to remain for long periods below the police radar was exposed in the National Socialist Underground (NSU) case. A neo-Nazi cell murdered 10 people, nine of them immigrants, between 2000 and 2007, while police failed to connect the attacks.
The NSU case was a wake-up call for the authorities, whose anti-terrorism efforts had been focused on the threat from violent Islamists.
But some now accuse the authorities of still underestimating the far-right terror threat.
The Hanau suspect has been named as Tobias R. The 43-year-old has been described as a lone gunman, and was found dead later at home next to his dead mother. He was a licensed gun owner and had not been under investigation previously.
The attack has reignited a debate in…