Attorneys accused of fraud in the dispersal of BP PLC’s $9.6 billion Deepwater Horizon oil spill settlement have attacked a special master’s investigative report as completely untrue and have asked a federal judge to vacate his order adopting the findings.

U.S. District Judge Carl Barbier appointed former FBI director Louis Freeh to investigate the settlement’s claims process. On Sept. 6, Freeh reported that two former senior attorneys for claims administrator Patrick Juneau had accepted fees for a client they’d referred to a New Orleans law firm.