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The detective in charge "is currently gathering information regarding the allegations."
Los Angeles authorities are looking into an accusation Mel Gibson beat up his ex-girlfriend in January.
A statement released by the sheriff's Malibu/Lost Hills station said the detective in charge of the investigation "is currently gathering information regarding the allegations" of the alleged attack on Oksana Grigorieva, the mother of the "Braveheart" actor's 7-month-old daughter.
"Due to the investigation being preliminary in nature, no other information is available at this time," according to the statement obtained by wire services.
The alleged incident occurred Jan. 6 at the 54-year-old actor's Malibu residence, according to the sheriff's department, which lists the alleged victim as the 40-year-old Grigorieva.
Last week, it was reported that Gibson was allegedly caught on tape calling Grigorieva a "whore" and other vulgarities during an argument. At one point, Gibson allegedly tells Grigorieva : "You look like a F------ pig in heat, and if you get raped by a pack of [racial epithet] it will be your fault." NBC has not confirmed that the tape exists.
The "Lethal Weapon" and "Mad Max" actor also allegedly threatens to "burn the house down" on the unconfirmed tapes.
In 2009, Gibson left his wife of 29 years and the mother of his six children to be with Grigorieva, a Russian pop singer.
Since their relationship soured in April, the pair has been locked in a custody battle over their 8-month-old daughter. Last week, their lawyers met in closed session with the judge handling the case, The Associated Press reported.
Grigorieva recently won a restraining order against Gibson, claiming he punched her and broke her teeth, a charge Gibson has denied.
Back in 2006, Gibson's career was nearly derailed when he went on an anti-Semitic and sexist rant against the officer who arrested him for driving under the influence.