The arrests follow last month´s raids on the Barclays Premier League club as part of an ongoing inquiry by the City of London Police´s economic crime unit.
A statement from Birmingham released on Wednesday read: "David Sullivan and Karren Brady on behalf of Birmingham City Football Club were invited to co-operate with a City of London Police investigation and have happily done so. By longstanding appointment, they have willingly attended interviews today. Birmingham City is fully committed to helping the Police with their enquiries."
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