The Mirror reports:
When fans attack! After the popstar was ambushed in Dubai, check out more star's that have come a cropper from supposed fans
There are few things you would expect at a Justin Bieber concert, such as hysterical screams from teenage fans, a two-hour delayed gig and some cheesy pop music.
But you definitely wouldn't expect to witness the unsuspecting twiggy popstar get attacked onstage by a crazed male.
The shocking incident in Dubai has sparked major security concerns for the teenager's safety after he was ambushed from behind by the ‘fan’ midway through a piano performance.
In a video uploaded to YouTube, the attacker is seen storming the stage and grabbing Bieber sending the piano crashing over as the pair tussle to the ground.
The 19-year-old singer freed himself and fled to the other side of the stage as security lunged at the potentially dangerous stage stormer.