The police say the arrest was made by detectives investigating criminality linked to the breach.
"Today's search operation, and subsequent arrest, is just one piece of a large-scale operation.
It was one of two breaches that emerged over a two-day period, which caused considerable concern among PSNI officers and staff who face continuing threat from paramilitaries andIn the wake of the data breach, nearly half of Northern Ireland's officers have contacted the Police Federation about potential damages.
The information appeared online for three hours last Tuesday, leading the PSNI to update its security advice to its officers and staff.
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