The mother of a 12-year-old boy was arrested in Connecticut yesterday after her son brought his grandfather’s World War II training grenade to a show-and-tell about the 70th anniversary of D-Day.

Stratford Academy Johnson House went into lockdown after Lisa Miguel’s son presented his grandfather’s World War II-era grenade simulator to his class.

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Miguel told police that the grenade simulator was a gift from her father, a World War II veteran, and that he had told her it was a “dud.” She had kept it in her home for years, and said she didn’t believe her father would have given it to her if it was dangerous.

Police told CBS 2 that she should not have taken her father’s word for it. “She should have contacted the Police Department or a military service to identify what the item was and if, in fact, it was a dud,” said Stratford Police Captain Paul DosSantos.

“It is technically property of the military, and civilians should not possess such an item.”

CBS 2 reported that most military souvenirs clearly indicate that they are no longer able to cause any damage, but the practice grenade that Miguel’s son brought to the D-Day presentation could still have been live. If it exploded, it would have done so with the power equivalent to that of a cherry bomb or an M-80.

Authorities charged Miguel with risk of injury to a minor, reckless endangerment and illegal possession of an explosive.

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Watch a report on the incident via CBS 2 New York below.