A three-year-old boy found a live hand grenade, similar to those used in World War II, in the front yard of his family’s home in Hartline Monday.

The hand grenade was found in the 600 block of Willard Street, the Grant County Sheriff’s Office (GCSO) announced .

The Washington State Patrol (WSP) bomb squad responded to the scene and safely disposed of the live hand grenade.

“An unexploded ordinance like that is a problem. An unexploded device, certainly due to its age, made it more unstable,” GCSO spokesman Kyle Foreman said.

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