LOS ANGELES, California (X17online) - According to E! Online, Rihanna has told police that her boyfriend Chris Brown "choked her while threatening to kill her and [she] subsequently lost consciousness."

The couple apparently began fighting after they left Clive Davis' pre-Grammy party on Saturday night, and just after midnight, the fight escalated in Brown's rented silver Lamborghini. Brown reportedly pulled his car to the side of the road in Hancock Park, and Rihanna allegedly grabbed the car keys and tossed them out the window, which caused Chris to become enraged.

Brown went outside and searched for the keys, came back to the car, put his hands around Rihanna's neck and, according to E! Online's source, told the R&B singer, "I'm going to kill you!" Rihanna told police that she lost consciousness after that, and when she awoke, Chris was gone.

A concerned bystander called 911, the police came and took Rihanna to the hospital where she was treated for her injuries.

Additionally, The Jakarta Post reports that Rihanna has cancelled yet another concert, this one in Jakarta, Indonesia. Rihanna previously cancelled her upcoming birthday bash and another show in Malaysia.