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FILE - Singer Chris Brown appears at a news conference to announce his partnership with Ford's Sync, a voice activated hands free in car communication and entertainment system, in this Nov. 2, 2007 file photo taken in New York. Authorities are investigating allegations that Grammy-winning singer Chris Brown assaulted a man in a West Hollywood parking lot Sunday Jan. 27, 2013. (AP Photo/Peter Kramer, File) Image Credit: AP

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, and fellow singer Frank Ocean tweeted that he had been attacked.

Deputies responding to a report of six men fighting Sunday night found the scene clear, but witnesses told them there had been a brief fight over a parking space.

“The altercation allegedly led to Chris Brown punching the victim,” the department said in a statement.

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

In a Twitter posting later, Ocean said he “got jumped by (Brown) and a couple guys” and suffered a finger cut.

Brown’s attack on singer Rihanna on the eve of the 2009 Grammy Awards overshadowed the show.

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

No arrests were made Sunday. The department said the investigation is ongoing.

Email messages to Ocean’s publicist and Brown’s lawyer were not immediately returned. A man answering the phone at the recording studio declined to comment.