German prosecutors have filed terrorism charges against three men whom they accuse of membership in an ethnic Hutu militia involved in killing Congolese civilians.

Bernard T., Felicien B. and Jean Bosco U. were charged with membership in a foreign terrorist organization — the Democratic Forces for the Liberation of Rwanda, known by its French acronym FDLR. Prosecutors didn't release the German nationals' last names Tuesday in accordance with German privacy rules.

The three were arrested in December. They're accused of forming a German cell of the FDLR in 2011 that took over propaganda operations for the group after the arrests of three high-ranking FDLR members in Europe.

Bernard T. faces an additional charge of breaching German export laws by giving money to another suspect.