A shot was fired during a major police operation in southern Germany against a group that is said to have met with weapons and Wehrmacht clothing.
During the search of an apartment in the Tübingen district, police officers opened a door with the use of firearms, said a police spokeswoman.
Nobody was injured.
There was no resistance from the suspects during the searches.
The spokeswoman could not say anything about possible motives or whether the group had plans to use the weapons.
The weapons check is also ongoing, it said.
400 police officers searched 17 apartments and a forest in Bavaria and Baden-Württemberg and confiscated weapons, ammunition and parts of uniforms, among other things.
The investigations are directed against a total of 19 men and women between the ages of 27 and 77 years.
They are said to have no license to carry weapons and to have used weapons for their war games that fall under the War Weapons Control Act.
They are also suspected of wearing clothing with anti-constitutional symbols.
Rescue workers also found grenades
According to the report, the emergency services also found grenades in the Sigmaringen district.
Two detonators had been detonated in a controlled manner.
So many weapons were confiscated in three districts in Baden-Württemberg that they had to be transported away by truck.
Experts now have to clarify whether they are real weapons or fakes.
During the operation, the Ulm police cooperated with the state criminal investigation offices of Baden-Württemberg and Bavaria as well as other police headquarters and special task forces.
The searched apartments are located in various locations in Bavaria and Baden-Württemberg.
The suspects were released for the time being, the investigation is ongoing.
Baden-Württemberg's Interior Minister Thomas Strobl (CDU) spoke of a "good, hard blow against extremist aspirations".
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bbr / dpa / AFP