A U.S. grand jury returned an indictment on Wednesday against 16 people in connection with the armed occupation of a wildlife refuge in Oregon, prosecutors said.

The U.S. Attorney’s Office in Portland did not disclose the charges contained in the indictment, which has been sealed, but said it would likely be made public soon. A previous criminal complaint charged 11 former occupiers with conspiracy to impede federal officers.

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(Reporting by Alex Dobuzinskis in Los Angeles; Editing by Dan Whitcomb and Sandra Maler)