Detectives from the Los Angeles County Sheriff's Department are investigating a photographer's claims that Justin Bieber assaulted him, the Los Angeles Times reports.

The photographer reportedly drew the singer's ire on Sunday after snapping pictures of Bieber and his girlfriend, Selena Gomez, exiting a movie theater at a mall in Calabasas. A scuffle ensued and the photographer called 911, but Bieber and Gomez had left the scene by the time the police arrived.

The photographer, who complained of chest pains following the incident, was taken by ambulance to be treated at a local hospital. He later filed a police report, and Bieber is now being investigated for misdemeanor battery.