Members of the public have been warned to be vigilant after the discovery of a bomb in the postal sorting office in Derry.
British army bomb disposal experts were called to the office in Great James Street yesterday afternoon after staff became suspicious about a package,
The viable device was in a white A4 envelope with the address written in a grey stencil.
Police have warned the public to be vigilant and to contact the PSNI immediately if they notice anything suspicious.
Last month, a number of letter bombs were sent to British army recruiting offices in England.
Last October, a viable device was delivered by a Derry post man to the offices of the Public Prosecution Service on Limavady in the Waterside area of the city.
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