Grammy-winning singer Chris Brown is under investigation for an alleged assault* in a West Hollywood parking lot, the Los Angeles County Sheriff’s Department said early Monday.

    It was reported that six men fighting on Sunday night over a parking space with witnesses.

    “The argument allegedly led to Chris Brown punching the victim,” the department said in a statement released on early Monday morning.

    The “victim” wasn’t identified, but the celebrity website TMZ, which first reported the fight outside the Westlake Recording Studio, said it also involved Frank Ocean, one of the top nominees at the Grammy Awards next month.

    It wasn’t Brown’s first problem in the run-up to the Grammys. His attack on singer Rihanna on the eve of the 2009 awards event overshadowed the show.

    Last June, he was injured in a fight with members of hip-hop star Drake’s entourage* at a New York nightclub.

    No arrests were made. Brown was gone by the time deputies arrived but the department said the investigation is ongoing and Brown would be contacted later.

    Brown, 23, remains on probation* for the attack on Rihanna and is due back in court on Feb. 6 to update a judge on his progress. Prosecutors have raised concerns about records showing that Brown has completed his community labor obligations.(SD-Agencies)