The two-minute clip of Mel Gibson using a racial slur and calling his ex-girlfriend a "whore" during an argument are unlikely to be the last ugly words the public hears from the actor.

RadarOnline.com, the celebrity website that posted the recording on Friday, said there would be more where that came from.

For 10 days, the site has posted written transcripts of secret recordings it said Gibson's former girlfriend, Russian singer Oksana Grigorieva, had made. The snippet released on Friday was the first audio of the confrontations that have been aired.

The clip includes segments in which a voice that sounds distinctly like the Academy Award winner is heard telling Grigorieva that she is dressing too provocatively and that it would be her fault if she were raped. The recording is laced with his swearing and racial slurs.

Shortly after the posting, entertainment news outlets reported that Gibson had been dropped by talent agency William Morris Endeavor, although that decision appeared to have been made days ago.

David Perel, RadarOnline's founder and executive vice president, said the site had heard "a substantial portion" of 30 minutes of recordings Grigorieva (40) had made. Perel said more audio clips would probably be made in coming days.

The site reported she made the recordings because she was afraid Gibson might harm her.

The Los Angeles County Sheriff's Department is investigating allegations that Gibson was involved in a domestic violence incident with Grigorieva, with whom he has an eight-month-old daughter. That inquiry is expected to take several weeks before it reaches prosecutors, who will decide whether to press charges.

Gibson's camp, for its part, remained silent about the recording. Spokesman Alan Nierob did not issue a comment.

It is the second high-profile incident in which Gibson has been accused of using slurs and degrading women. He apologised after his drunken driving arrest in 2006 after it was revealed by another celebrity website, TMZ, that he had made anti-Semitic and sexist comments.

In the recordings, the actor is heard criticising Grigorieva for the way she dresses and accuses her of lying to him about having breast implants.

"They just look stupid," Gibson tells her at one point in the recording. "Keep them if you want to. They look like a Vegas bitch, a Vegas whore."