German federal prosecutors say they've filed charges against eight Germans on accusations they formed a far-right terrorist organization and carried out bombing attacks on asylum-seeker facilities and left-wing political targets.

The seven men and one woman are accused of forming in 2015 the "Freital Group," named after a suburb of the eastern city of Dresden that has seen a string of anti-refugee protests and other incidents.

Using banned powerful firecrackers from the Czech Republic, prosecutors say they made pipe bombs and other improvised explosive devices.

They're accused of several attacks, including blowing up the car of a Left party politician, as well as two bombings of refugee homes in which windows were blown out and one asylum-seeker suffered facial cuts.

All eight have been in custody since April.