The disclosure came after detectives interviewed Grigorieva about the alleged attack at an undisclosed location in Malibu. Sheriff's spokesman Steve Whitmore said Grigorieva was the only person interviewed so far in the case. Gibson and Grigorieva have been involved in a nasty custody dispute over their infant daughter — the subject of a confidential court case. Whitmore declined to disclose further details of the domestic violence investigation or any potential evidence.

"We're in the process of verifying, verifying, verifying," Whitmore said. "All the allegations that have been put forth will be thoroughly investigated." The actor has not publicly discussed the breakup with Grigorieva, 40. The former couple first revealed their relationship shortly after Gibson's wife, Robyn, filed for divorce last April. The divorce is pending.