Brown is being investigated by Los Angeles police for assault after he and Frank got into a fight on Sunday over a parking spot at Westlake Recording Studios, reported Showbizspy.

"Rihanna wasn't there and she doesn't have anything to do with that. She hopes both Chris and Frank are all right," a source said. Brown is still on probation after physically assaulting Rihanna in 2009.u00a0

Rihanna and Chris Brown