Justin Bieber has been accused of assaulting a photographer in Los Angeles.

The 18-year-old singer was allegedly involved in a physical altercation with a paparazzo while he was with girlfriend Selena Gomez at The Commons mall in Calabasas, California, where they had gone to see a film.

The 'Never Say Never' hitmaker - who has just bought a $6.5 million house in the area - is thought to have been involved in a scuffle after the photographer attempted to take pictures of the pair, TMZ reports.

Witnesses also claimed the paparazzo was blocking Justin's car in as the 'Boyfriend' singer was attempting to leave the shopping centre.

Following the alleged incident, the photographer phoned the police - who arrived after Justin and Selena had left the area - and was taken to hospital complaining of chest pains.

The officials are now thought to be keen to speak to Justin and other witnesses after the snapper filed a report to police naming the pop star as the culprit.