Justin Bieber is wanted for questioning by police in Los Angeles after a photographer complained of being roughed up by the pop star at a shopping centre.
Los Angeles County Sheriff's Lieutenant Robert Wiard said the photographer called police on Sunday and complained of pain to his chest.
Lt Wiard said the scuffle happened when the photographer tried to take pictures of Bieber and his girlfriend, teenage actress Selena Gomez, after they walked out of a theatre.
The photographer was taken to a hospital, where he was treated and released.
Lt Wiard added Bieber and Gomez left before deputies arrived, so investigators want to get his side of the story.