Los Angeles , California ( CNN ) -- Audio released Friday purportedly captures an argument between Mel Gibson and ex-girlfriend Oksana Grigorieva , in which he launches into a racist , sexist rant against her . RadarOnline released the audio , claiming the male voice is that of 54-year-old Gibson . CNN has not independently confirmed the authenticity of the tape and the voices on it . At one point on the roughly two minute tape , the man says : `` You go out in public and it 's a f***ing embarrassment to me . You look like a f***ing b**** on heat and if you get raped by a pack of n***ers it will be your fault . '' It 's unclear when the audio was recorded . Meanwhile , the William Morris Endeavor Publicity firm confirmed Friday that Mel Gibson is no longer their client . Earlier this week , the Malibu Hills Police Department opened an investigation into the alleged domestic violence dispute between Gibson and Grigorieva , 40 , CNN has confirmed . Gibson has been caught in a custody dispute with Grigorieva over the couple 's 8-month-old daughter . Toward the end of June , Grigorieva filed a restraining order against Gibson alleging that the actor and director struck her in the face , People magazine reported . Police said they are still in the process of gathering information surrounding Grigorieva 's allegations . CNN reached out to both Gibson and Grigorieva 's representatives for response and to verify the authenticity of the audio . Mel Gibson 's longtime publicist , Alan Nierob , on Friday evening said , `` We ca n't comment due to legal nature of the matter . '' A spokesman for Grigorieva confirmed that the female voice heard on the audio tape obtained and posted by RadarOnline is the voice of Grigorieva . Stephen Jaffe also told CNN that the transcript as published on RadarOnline is an accurate transcript of a conversation she was engaged in with Gibson . Jaffe said the site did not receive the tapes from Grigorieva . She `` absolutely did not provide any tape to the media , '' Jaffe said . Grigorieva has spoken with sheriff 's deputies and has provided a statement to them in their domestic violence investigation , Jaffe said . The publicist said Grigorieva did not initiate the investigation . Gibson came under fire for a racially charged tirade in 2006 , when he admitted to making anti-Semitic remarks during a drunken driving arrest . He issued an apology at the time , and appealed to the Jewish community to help him recover from his alcohol addiction .
NEW : Grigorieva 's camp confirms her voice is on male . Tape purportedly captures fight between actor and ex - actor . Site confirms male voice is that of actress . Police investigating domestic violence case against actor .