A British Royal Navy submariner has appeared in court charged with breaching the Official Secrets Act.
29-year-old Petty Officer Edward Devenney, from Strabane, was remanded in custody at Westminster Magistrates' Court.
Devenney was arrested in Plymouth on Tuesday morning and charged on Wednesday night.
Wearing a blue polo shirt and jeans, he confirmed his name and date of birth at Westminster Magistrates Court yesterday.
He was represented in court by Lord Carlile QC. Five plain clothes police officers were also present.
He is accused of communicating information on 28 January 2012 "which could be deemed to be useful to an enemy of the British state".
A spokesman for the Metropolitan Police, which made the arrest, said several searches had been carried out as part of the operation but it was unable to give any more information about the incident.
PO Devenney did not enter a plea to the charge of disclosing information gained in contravention of section 1 of the Official Secrets Act 1911.
He is due to appear at the Old Bailey on 14 June.