Mel Gibson Interviewed by Sheriff's Investigators

7/27/2010 3:00 PM PDT

Mel Gibson Interviewed by Sheriff's Investigators

Law enforcement sources tell TMZ Mel Gibson met with L.A. County Sheriff's detectives Sunday for his official interview in connection with his criminal complaint that Oksana Grigorieva tried to extort him.

We're told the meeting was lengthy and that Mel and his lawyer submitted "physical evidence" -- including emails and texts -- to make a case that Oksana extorted him.

Our law enforcement sources also tell us ... Mel did not discuss Oksana's criminal complaint against him. We're told that was one of the ground rules set by Mel's lawyer.

Gibson does not have to discuss Oksana's claims based on his Fifth Amendment rights against self-incrimination.