South Wales Police said the arrests of a retired officer and a civilian worker were connected to the alleged disclosure of sensitive information.
The men, who are both from the area, were arrested on Tuesday.
The investigation is being supervised by the Independent Police Complaints Commission (IPCC).
A South Wales Police spokeswoman said the Serious and Organised Crime Agency arrested the men in conjunction with officers from South Wales Police's anti-corruption unit.
She said the arrests related to "corruption and unlawful disclosure of sensitive information" and related to "current information and intelligence".
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