Mel Gibson Being Investigated for Domestic Violence

 Michael Caulfield/OG/Getty Images for Chernobyl Children's Project International

Mel Gibson is being investigated over a possible domestic violence incident involving his ex Oksana Grigorieva.

"We opened an investigation into allegations and those do involved domestic violence and other things. We did our first interview on Monday and the investigation is on-going. When it is compete, we will turn it over to the District Attorney just like we do in any case. We take these allegations seriously and we are moving ahead. It will be a thorough and exacting (investigation). The DA will be the ultimate purveyor of what will happen," Los Angeles County Sheriff's Department spokesperson Steve Whitmore tells

The attack allegedly occurred Jan. 6.

On June 21, Grigorieva, 40, filed a restraining order against Gibson, 54, stating that he punched her in the face and knocked out her teeth. A Gibson source tells Us Weekly: "They got into it, but he absolutely did not injure her."

The actor then turned around and filed his own restraining order against Grigorieva, prohibiting her from speaking about certain aspects of their case.

They are both due in court July 20 over the restraining order.

Gibson and Grigorieva are engaged in an ugly custody dispute over their 8-month-old daughter, Lucia.

Sources tell Us that Grigorieva's claims are a ploy for more custody — and cash. (His lawyer Stephen Kolodny tells Us the duo had reached an agreement in May that would lead to fifty-fifty custody.)

Grigorieva (who has son Alexander, 12, with actor Timothy Dalton) claims Gibson — worth a reported $900 million — is refusing to give her child support and forcing her to rack up debt.

"I am having to live on credit cards," she told the U.K.’s Daily Mail June 26.

Last year, Gibson divorced his wife of 28 years, Robyn, with whom he has seven children. The two reportedly had no prenup, which means she walked away with about $450 million.

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