"He could have killed us all," the Russian musician tells PEOPLE in an exclusive new interview
Credit: Michael Kovac/FilmMagic

As the drama surrounding Mel Gibson and Oksana Grigorieva continued, the Russian-born musician is going into greater detail about the domestic violence she says she suffered at Gibson’s hands.

Grigorieva, 40, alleges that a livid Gibson, 54, flew off the handle at her on Jan. 6 in the presence of their 1-year-old daughter Lucia and her 13-year-old son Sasha (from a previous relationship with actor Timothy Dalton).

Gibson’s attorneys declined to comment for this story, but they have repeatedly disputed her allegations. The L.A. District Attorney is determining whether to charge Gibson with for domestic violence, while an L.A. sheriff’s investigation is underway as to whether Grigorieva tried to extort millions from the actor in exchange for keeping explosive audiotapes between the two private.

But in an interview with PEOPLE, Grigorieva – who was romantically involved with Gibson for two years – says the star became enraged on Jan. 6 for no specific reason and repeatedly struck her while she held Lucia and Sasha cowered under the bed.

“When the domestic violence event happened … we were completely terrified and devastated,” Grigorieva tells PEOPLE. “Mel kept spitting on my face until it was covered in saliva …he kept screaming like a crazy man. It’s a scary sight.”

“He says get the eff out and then he pulls a gun out,” she says. “He could have killed us all.”

For much more about Oksana Grigorieva’s relationship with Mel Gibson, look for the Oct. 18 of PEOPLE, on newsstands now