Washington, Feb 13 : Pop star Chris Brown and Rihanna are stuck in Los Angeles, as cops investigating their domestic abuse case have ordered them not to leave the town.

After Brown allegedly attacked the `Umbrella' hitmaker, and left her with horrific injuries, both are holed up in different accommodations in L. A. for further questioning.

While Rihanna, who was left with a split lip, a bloody nose and bite marks on her hands, is getting sympathy, Brown is being criticized for allegedly attacking her.

Although the incident has been in the headlines ever since Rihanna was hospitalized, Brown has not yet issued an apology, as he still is reportedly hoping that the cops will retract their charges against him.

"Can you believe that Chris hasn't even issued an apology? Three days and nothing," Fox News quoted a source as saying.

Brown has been accused of threatening to kill Rihanna, after the duo got into an argument over a text a message from other woman, after which he attacked her and left her unconscious with a split lip, a bloody nose and bite marks on her hand. (ANI)