The bomb squad was investigating a suspicious object at Blendon Woods Metro Park in northeast Columbus Tuesday morning.
According to officials with the Metro Parks, someone on Monday walking in the park reported an object that looked like an old grenade.
On Tuesday, that item was discovered on a picnic table, and the fire department was called to the scene.
Bomb squad officials were called to the scene shortly after 11 a.m.
Officials said that the item was a grenade and planned to take it from the park for investigation.
The scene was cleared shortly after noon.
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