(1) Criminal offenses within the jurisdiction of any court inferior to the district court shall be prosecuted by complaint. All criminal actions in district court, except those on appeal, shall be prosecuted either by information, after examination and commitment by a magistrate or after leave granted by the court, or by indictment without such examination, commitment or leave.

  (2) A grand jury shall consist of eleven persons, of whom eight must concur to find an indictment. A grand jury shall be drawn and summoned only at the discretion and order of the district judge.