Police say the arrest was made by detectives investigating criminality linked to the breach.
Last week, Mr Byrne apologised for what he described as a breach of data on an "industrial scale".
The first, and biggest, breach happened when data was made public in error by police responding to a routine Freedom of Information request. The surname and initials of every employee, their rank or grade, where they are based and the unit they work in, including sensitive areas such as surveillance and intelligence, were included.
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