Mel Gibson and OksanaThe Los Angeles Sheriff's Department is investigating Mel Gibson over an alleged domestic violence incident from earlier this year involving ex-girlfriend Oksana Grigorieva.

According to a news release sent Thursday afternoon, police have opened an inquiry into the alleged attack, which is dated Jan. 6, and are "currently gathering information regarding the allegations."

Sources tell TMZ that incidents also occurred in February and that Grigorieva, who has a young daughter with Gibson, spoke to deputies on Monday.

Grigorieva recorded conversations with her ex in which the actor allegedly threatens her and uses racial slurs. In one of those tapes, acquired but not released by RadarOnline.com, Gibson allegedly told Grigorieva she "f***ing deserved" to get hit.