A curious boy’s discovery closed down part of Clinton’s riverfront on Monday afternoon. Police say a father and son were walking along the Mississippi River when the boy picked up what he thought was rock. When he showed it to his father, he thought it was a hand grenade.

The father placed the device in a planter on Riverfront Drive between the Showboat and the Mississippi Belle docking area and contacted police.

The first officer to arrive on the scene did confirm that the device was a hand grenade. The area was blocked off to vehicular and pedestrian traffic.

The Quad City bomb squad of the Davenport Police Department and the State Fire Marshal’s office were called to the scene. The grenade was removed from the scene for proper disposal without incident. The incident remains under investigation.