London, July 22 (IANS) Police have launched an investigation into actor Mel Gibson’s claims that his ex-girlfriend Oksana Grigorieva tried to extort $10.07 million to keep recordings of his telephone rants private.

The secret audio tapes allegedly featuring an enraged Gibson hurling expletives and abuse at the Russian singer emerged days after Grigorieva accused him of hitting her during heated arguments before they split earlier this year.

Los Angeles police have since launched a domestic violence investigation into her claims as the former couple fight over custody of their baby girl, Lucia, reports dailystar.co.uk.

The ‘Braveheart’ star’s legal representatives have denied the attack allegations and have since countered that Grigorieva tried to hit Gibson for a big cash payout in exchange for the audio footage.

Gibson’s attorney, Blair Berk, formally filed the complaint with the Los Angeles County Sheriff’s Department on Tuesday and the lawyer is believed to have evidence to prove the extortion claims.

‘Extortion allegations have been brought to our attention and we are certainly going to be looking at that,’ said Sheriff’s spokesman Steve Whitmore.