PETERSBURG – Mark Weaver, 59, was indicted by a Grand Jury in U.S. District Court on two counts of Possession of Unregistered Destructive Devices in conjunction with an explosion at the Petersburg rock quarry July 13. He was arrested Aug. 27 in Tacoma, Wash.

According to court documents, “Weaver did knowingly possess a destructive device which was not registered to him.” The document also states that Weaver possessed seven hand grenades, which were also unregistered.

The prosecutor Assistant U.S. Attorney Joseph Bottini said, “The first device (in count one) is the device that deton...