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Mel Gibson is doing "fine" after a single-car collision just north of Malibu, his rep Alan Nierob tells

Woman believed to be Mel Gibson's ex-girlfriend: You hit our baby while she was in my hands

The 54-year-old actor's 2008 Maserati crashed into a hillside Sunday evening, California Highway Patrol spokesman Leland Tang tells Gibson sustained moderate damage to his car, which he was driving alone. Authorities say do not suspect alcohol was involved in the accident.

"At the collision scene, Mr. Gibson was extremely cooperative and had no objective symptoms of intoxication," Tang says. "He was not acting abnormally."

Mel Gibson under investigation for possible domestic violence

Gibson is currently under investigation by the Los Angeles County Sheriff's Department with possible domestic violence charges involving former girlfriend, and mother of his child, Oksana Grigorieva.

Grigorieva is also being investigated for extortion claims made by Gibson after the release of purported audio tapes of Gibson yelling at and threatening her.