At 3.50pm on Saturday, October 13, Sussex Police were called after a hand grenade was found in a bag of donated items given to the Mind charity shop in Goring Road, Worthing.
An officer visited the shop but because they did not know if the grenade was live, they contacted the army’s explosive disposal unit.
They came and upon inspection discovered that the grenade had been deactivated and did not pose a danger to the public.
According to the police, the donator of the item was traced and was very sorry for the concern they had caused.
A police spokesman said: “If you have any militaria items that you wish to dispose of and are unsure of how to dispose of them please contact us for advice.”