Rihanna has told police that Chris Brown choked her and threatened to kill her during the alleged assault last weekend, a website report claims.

Eonline.com is quoting a source close to the investigation who has exclusively confirmed to them that 'Rihanna has alleged to police that Brown choked her while threatening to kill her and, subsequently, she lost consciousness.'

It's also believed that the Los Angeles district attorney has asked police to collate more evidence to strengthen the case against Brown.

As reported yesterday, TMZ.com claimed that Rihanna suffered 'two huge contusions' to the head, bleeding lips and bite marks to her arms and fingers.

19-year-old Brown has been charged on suspicion of making criminal threats and has been released on $50,000 bail.

Brown's lawyer and publicist have not responded to requests for comments on the chilling allegations.

(by Scott Colothan)