Rihanna arrives at the Recording Academy's Clive Davis pre-Grammy party in Beverly Hills, February 7, 2009.[Agencies]

LOS ANGELES – Singer Rihanna postponed a scheduled concert in Malaysia on Tuesday as Los Angeles police continued their probe of an attack by R&B star Chris Brown on a woman widely believed to be the pop songstress.

Malaysia-based Pineapple Concerts said in a statement on its website that "in light of recent events involving Rihanna" a new date for the concert will be set within two weeks.

In Los Angeles, police presented the case against Brown to prosecutors, but were asked to conduct further investigation, said Sandi Gibbons, a spokeswoman for the L.A. District Attorney's Office.

Police have not publicly said that Rihanna, whose hit songs include "Umbrella" and "Disturbia," was the victim of Brown's attack early Sunday morning ahead of the Grammy awards, where they were both scheduled to perform.

But unnamed police sources have told the Los Angeles Times that Rihanna was and that she was cooperating with police.

In recent days, her publicist has issued only one statement, which said: "Rihanna is well. Thank you for concern and support."

Brown, 19, has been arrested and charged with making criminal threats. He is currently free on bail.

The incident occurred in Brown's car, and celebrity websites and magazines have said Brown left the scene and police found Rihanna, 20, suffering from a bloody nose, split lip and bite marks in the vehicle. She was taken to Cedars-Sinai Medical Center in Los Angeles, but later released.

E! Online reported that a 21st birthday celebration planned for the Barbados-born singer in New York had also been canceled.

The National Basketball League said Brown had withdrawn from a celebrity game scheduled for this weekend as part of the NBA all-star game. Brown's hit songs include "Forever" and "Kiss Kiss."