Four Finnish men were charged with plotting violence against migrants, political figures and critical infrastructure using weapons made with 3D printers.

Prosecutors accused three of those men of engaging in terrorism Thursday, according to The Associated Press. Those suspects were said to be training for racially-motivated armed conflict.

All the suspects reportedly supported neo-Nazi ideology including “accelerationism,” which the American Civil Liberties Union calls “a term white supremacists have assigned to their desire to hasten the collapse of society as we know it.”

Prosecutors don’t believe the suspects’ training advanced to the point of practicing specific terror strikes. Only one of the unidentified suspects remained in police custody Thursday.

“Based on their racist beliefs, the defendants are suspected of having prepared for an armed conflict between population groups, in which people would be killed and the structures of society would be undermined by attacks using home-made firearms,” prosecutors said in a statement.

Finnish police said the radicalized quartet collected information on ideological opponents including left-wing policy activists. They also hoped to sabotage railroads and power grids.

Right-wing activists in the U.S. have also been accused of targeting infrastructure to advance their political agenda.

In February, a neo-Nazi Florida man and an alleged accomplice were accused of conspiring to damage Baltimore’s power grid out of ”racially motivated hatred.” In 2019, authorities accused a Colorado neo-Nazi living in public housing and dependent on soup kitchens on similarly wanting to bring down “the system.”