Police have searched the offices of the Italian football federation as the refereeing scandal appeared to be broadening.

The federation confirmed that a search was being conducted. According to news agency ANSA, authorities seized documents related to a probe concerning the 2004-2005 season.

ANSA also reported the association of Italian referees was also being searched. It said the operation was related to suggestions that Juventus colluded with officials over the appointment of referees.

The entire Juventus board resigned Thursday, and General director Luciano Moggi is under investigation in Rome and Naples for allegedly trying to influence the choice of referees.

Italian federation president Franco Carraro resigned earlier this week following initial reports of the scandal. Also, UEFA said it had reprimanded Italian referee Pierluigi Pairetto for disclosing confidential information to represnetatives from Juventus.