Mel Gibson was formally interviewed Wednesday by Los Angeles County Department of Children and Family Services, Breaking Celebrity News has learned exclusively.

A source close to the actor tells us: "The meeting lasted for several hours."

DCFS is investigating the situation involving Mel and Oksana Grigorieva.

OFFICIAL PHOTOS: Authorities Examining Mark On Baby’s Face

The former lovers, and parents of eight-month-old daughter Lucia, are involved in a bitter custody war. Oksana says that Mel punched her in the head twice on January 6 while she was holding the baby.

Breaking Celebrity News ran exclusive evidence photos of the baby with a mark on her chin. Oksana has told authorities she observed the mark and blood after Mel punched her.

Mel has denied it. He said that Oksana shook the baby.

EXCLUSIVE PHOTO of Oksana After She Says Mel Punched Her

But Oksana's dentist, as first reported by Breaking Celebrity News