Stephan Kramer, head of domestic intelligence agency in Thuringia, said recent investigations have shown that far-right groups are becoming increasingly violent.
"There is a growing affinity with physical training, combat sports and shooting exercises. This shows that they are more inclined towards violence," he told media group Redaktionsnetzwerk Deutschland.
Police arrested 7 far-right extremists this week in the eastern city of Chemnitz on suspicion of plotting terror attacks against foreigners and political opponents.
They were suspected of founding a terror group named "Revolution Chemnitz", which according to the police, planned a sensational terror act on Oct. 3, Germany's national unity day.
Since August, far-right groups have organized rallies in the city of Chemnitz, Saxony, and hunted down people deemed "foreign-looking" people and attacked migrant-owned shops.
Anadolu Agency