Mravak landed in custody this July on suspicion that he, former Deputy Prime Minister Damir Polancec and Ivan Kostan, former CEO of the Sibenik Light Metal Factory, defrauded HEP of HRK 600 million. However, USKOK is also investigating him for selling electricity at a price far below the market value to two firms within the DIOKI concern, and for approving a HRK 15 million loan to the concern with a 60-day repayment period and a 10.5% interest without consulting HEP's board of directors.
Mravak is also suspected of enabling Rade Buljubasic, a returnee from Australia, to receive a HEP salary without working for four years and to buy a flat at a preferential price. Although he was paid by HEP, Buljubasic was actually working at the headquarters of the HDZ party. This case is in the jurisdiction of the Zagreb County Prosecutor's Office and not USKOK.
Media speculate Mravak has recently told investigators that he had done everything on instructions from above and that he had given HEP money to the then treasurer of the ruling HDZ party, Mladen Barisic, who was recently arrested in a case involving the Fimi Media advertising company. USKOK has allegedly struck a deal with Mravak under which he will not be accused that case in exchange for testifying.
While leaving the Remitenec prison premises, Mravak did not want to answer reporters waiting for him and referred them to his counsel.