Antique grenade kills father and injures children in Indiana home.

A father died and his two sons were injured after an antique hand grenade, discovered while going through their grandfather's belongings, detonated in their home. The incident is under investigation by the Lake County Sheriff's Office and the Bureau of Alcohol, Tobacco, Firearms and Explosives. Similar incidents have occurred in the past as collectors seek out grenades as wartime relics, some of which still carry active explosives.