The inert relics, some as big as a grapefruit, were detected when agents X-rayed checked bags.
Category: Bombs and Explosives
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T.S.A. Finds 5 Civil War Cannonballs in Passenger’s Luggage in Alabama
The New York Times – Travel:

The inert relics, some as big as a grapefruit, were detected when agents X-rayed checked bags.