STEYNING Police Station was evacuated and cordoned off after a woman brought in a live army shell.
The incident happened around 11.30am on Friday.
A police spokesman said the shell was brought in as part of a war memorabilia that was being safety checked.
But it turned out to be a live device and bomb disposal experts were called to the station.
The spokesman added: “Due to this item having a pin still attached a cordon was instructed in the rear yard of the car park until a specialist team arrived.
“A Royal Navy bomb disposal unit from Portsmouth attended who confirmed it was a live explosive shell. This was taken by the unit to Washington Quarry where a controlled explosion was carried out.
“Thankfully this incident was rectified with no injury to any persons involved, however police are wishing to state if members of the public do come across or own any item of a similar nature which they believe could be live to please leave it in the location where found, do not touch it and call Sussex Police immediately.”