Mel Gibson confronted a photographer on Tuesday night (24Jan12) after his friend fell to the floor trying to prevent the snapper from taking shots of the star.
The Mad Max actor was pursued by a paparazzo in Malibu, California and his pal attempted to deter the cameraman - but ended up falling to the ground when they collided.
In video footage of the incident, taken by Tmz.com, Gibson shouted at the snapper, "Hey, stop running around, dude. I saw you attack him. We are getting the police because you assaulted him."
Addressing his friend, the actor added, "Hey, call the cops and report that this guy assaulted you, I saw him do it."
Gibson's pal then claimed, "You ran into me!", but the photographer insisted: "I didn't attack him, he attacked me."
A member of Gibson's party is reported to have called police but no report of a crime had been filed as WENN went to press.