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Training hand grenades are lined up at Fort A.P. Hill, Va., during range training May 6, 2023.

Training hand grenades are lined up at Fort A.P. Hill, Va., during range training May 6, 2023. (Brendan Cassidy/U.S. Army)

LAKES OF THE FOUR SEASONS, Ind. — A hand grenade exploded as a family went through a grandfather's belongings in Indiana, killing a man and wounding his two teenage children, police said.

The explosion occurred Saturday in a garage area at a home in Lakes of the Four Seasons, about 30 miles southeast of Chicago, the Lake County sheriff's department said.

Bryan Niedert, 47, died and a 14-year-old boy and 18-year-old girl were taken to a hospital with shrapnel wounds.

"Investigators are still trying to determine elements of the case including, but not limited to: whether the device may have self-detonated due to its age or other factors, whether the pin was pulled or whether any other circumstances may have been involved," the sheriff's department said.

Enthusiasts collect grenades as memorable wartime relics, and although most of the antiques are deactivated, some grenades continue carrying active explosives, ABC News reported.

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