SALT LAKE CITY (AP) - Utah authorities are trying to determine how a live hand grenade ended up in a rock pile near a recreational vehicle dealership in Carbon County.
Deputies had responded after receiving a report of the grenade being found on Wednesday near the town of Helper.
A bomb squad was called and two robots were used to transport the grenade from the rock pile to an 8-foot-deep hole where it was detonated.
Investigators suspect the rocks had recently been delivered from Utah County but they have not yet nailed down an exact location.
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