CHEYENNE, Wyoming - Prosecutors say they won't file any charges after police used a Taser to try to subdue a 76-year-old man driving an antique tractor during a parade.

Converse County Attorney Quentin Richardson released a statement Monday after reviewing the state Division of Criminal Investigation's report into the Aug. 1 incident.

Glenrock Police Chief Tom Sweet says tractor driver Bud Grose ignored an officer's traffic command and then kept driving until officers pulled in front of him.

Sweet says an officer shocked Grose with a Taser, but that failed to subdue him.