According to the Princeton Fire Department:

Princeton Firefighters and PPD are on scene with a grenade located by a passerby near a sidewalk in the 200 block of South Prince St. Evansville Bomb squad Are on scene and are assessing the situation. All precautionary measures have been taken to ensure the safety of the public A small evacuation has occurred At the recommendation of the bomb squad. No determination whether the grenade is active or inactive we will keep you posted please stay away from the area until further notice