Chris Brown was involved in an all-out brawl with Frank Ocean Sunday night, and sources connected with Chris insist Ocean started it.

Chris was at Westlake Studio in the L.A. area listening to one of the artists he represents.

It was said that as Chris wanted  to take his leave, Frank Ocean and his crew blocked Chris from leaving. The sources say Frank said, "This is my studio, this is my parking spot."

We're told Chris went to shake Frank's hand and that's when one of Frank's people attacked Chris.

Sources connected with Chris say one of Chris' friends jumped in front and hit Frank's friend.

Sources connected with Chris say Frank then came at Chris.

Chris pushed him away and they started brawling.

The police were called and thanks to them.

Police have cleared the scene. We're told Chris Brown was not there when officers arrived but they did speak to Frank Ocean.

At this point we're told no one wants to press charges, and no arrests have been made.