The discovery of a training grenade closed the University of Wisconsin-Madison Arboretum for a couple hours as authorities investigated.
The incident took place Aug. 4 at about 9:30 a.m. when a university police officer on routine patrol in the arboretum was flagged down by a passerby who reported they saw a grenade sitting on a railing on the boardwalk near Mills Street entrance, according to a news release from UWPD.