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Mel Gibson is under the gun for an alleged rant against former girlfriend and mother of his youngest child, Oksana Grigorieva, in which he says she deserves to "raped by a pack of n***ers," according to RadarOnline.com.

The actor was allegedly reacting to the way Grigorieva was dressed. According to the report, his racist outburst has been caught on tape.

In addition, Gibson allegedly tells Grigorieva that he will burn down her home and says, "You look like a f***ing pig in heat, and if you get raped by a pack of n***ers, it will be your fault." He adds, "You're an embarrassment to me."

Gibson, 54, and Grigorieva, 40, are the parents of Lucia, their infant daughter.

According to various online reports, Oksana claims the actor punched her in the face, gave her a concussion and knocked out her front teeth.

A source tells Radar, "Oksana's motivation for recording this was to show Mel how mean he was, and because she feared for her life."

The former couple have served each other restraining orders and are currently battling over money issues concerning their young daughter. Mel also filed a notice of visitation rights and child custody along with a notice regarding an upcoming court hearing.

Mel Gibson and Oksana Grigorieva's reps have not returned our calls.