Gibson, 50, was arrested on suspicion of drunken driving at 2:36 a.m. Friday, according to the Los Angeles County Sheriff's Department.
The actor-director was detained while driving along Pacific Coast Highway in Malibu, said Steve Whitmore, a spokesman for the sheriff's department. Gibson was booked and later released from custody.
"Right now, it's an ongoing investigation," Whitmore told E! News.
Gibson's bail was set at $5,000, online records show.
"We don't have any information on [the arrest], but are checking into it," said Alan Nierob, Gibson's publicist