Police Investigating Extortion Allegations against Mel Gibson’s Ex Oksana Grigorieva

The Los Angeles County Sheriff's Department has confirmed to Entertainment Tonight that they are investigating extortion allegations against Mel Gibson's ex-girlfriend and mother to his child Oksana Grigorieva.

A rep for Grigorieva told ET last week that she did not release explosive audio tapes that feature Gibson sounding off in expletive-laden tirades directed at Grigorieva to Radar Online. Steve Jaffe, who represents Grigorieva, said that the tapes were not edited, calling the reports that suggest they were edited "ridiculous."

Gibson is also under investigation for suspicion of domestic violence and assault with a deadly weapon. The headline-grabbing audio tapes will be reviewed by forensic detectives.