** FILE ** In a Dec. 12, 2008 file photo singers Rihanna and Chris Brown perform at Madison Square Garden in New York. Rihanna and Brown were last minute absences at the Grammy Awards Sunday Feb. 8, 2009. (AP Photo/Evan Agostini/file)
LOS ANGELES - New details have emerged over the alleged incident on Sunday morning between Chris Brown and a woman who authorities have not officially identified, but a source tells Access Hollywood is Rihanna.
The music recording stars were both no-shows at last night's Grammy Awards.
The source told Access Hollywood that Chris Brown allegedly hit Rihanna with his fists and bit her during the alleged incident, which took place around 12:30 a.m. on Sunday.
Brown, 19, was arrested on Sunday and charged with felony criminal threats. He was released on $50,000 bail.
Brown, known in addition to his singing for his athletic feats of dancing — he has performed upside-down — previously said he studied martial arts, according to the New York Daily News.
The Los Angeles Police Department is still investigating the alleged domestic violence felony battery and told Access that additional charges may be filed.
Authorities released information to Access Hollywood that Brown and a woman were arguing in a car in the Hancock Park area of Los Angeles just after midnight on Sunday. Brown reportedly stopped the car, he and the woman got out and the argument escalated. LAPD reports the woman suffered visible injuries.
Following the incident, Brown reportedly left, leaving Rihanna at the scene.
Radar Online reported that a source inside Cedars-Sinai Medical Center, where Rihanna was reportedly taken following the incident, said the singer became emotional when two female “assistants” went to visit her at the facility.
“Rihanna was clearly very upset by what had happened and I could hear her screaming,” the source said. “Rihanna was trying to get her point across about something, she sounded like she was crying as she tried to get… her point across.”