Investigation into leak is underway.
Lives were put at risk after the personal details of hundreds of Northern Ireland prison officers were emailed to a third party by mistake.
Staff names and dates of birth were sent out accidentally to a third party who is thought not to have been security vetted to receive such information.
The risk is that with such information, terrorists in the region could find out the addresses of prison staff.
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Source: http://www.infosecurity-magazine.com/