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Members of the "boogaloo" movement tried to cover up evidence in a federal probe, officials said.
A member of a California group was arrested and charged with killing a federal officer.
Four members of that group deleted messages that referenced the incidents that led to his arrest.
Members of the "Boogaloo" extremist movement were charged with conspiring to destroy evidence tied to the investigation of a fatal shooting of a federal officer, authorities said on Friday.
Four members of the Northern California-based Grizzly Scouts allegedly tried to cover up that one of their members had shot and killed the officer, a federal grand jury indictment said.