Rihanna Claims Chris Brown "Choked" Her During Their Brawl

Rihanna has reportedly claimed Chris Brown choked her until she was unconscious during an alleged assault on Sunday.

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The "Umbrella" singer is fully co-operating with police - who booked Chris on suspicion of making criminal threats - and has also alleged he threatened to kill her during the attack.

Rihanna and Chris started arguing after leaving Clive Davis' pre-Grammy party on Saturday, resulting in Chris stopping his silver Lamborghini in a Los Angeles side street.

Gossip website E! reports Rihanna threw Chris' car keys out the window, sending the 19-year-old singer into a rage.

After failing to find the keys, he allegedly returned to the car, put his hands around Rihanna's neck and screamed: "I'm going to kill you."

It is claimed Rihanna lost consciousness and when she came round Chris had fled. Officers who attended the scene were said to be so shocked at her "horrific" injuries - including a split lip, bruised face and bite marks - they drove her straight to Cedars-Sinai Medical Center.

The singer - who is now in hiding - has cancelled her 21st birthday party, which was due to take place on February 20, and part of her tour.