Bieber was at his piano performing “Believe” when a young man ran onto the stage and tackled him from behind.
The impact knocked Bieber to the ground and turned the piano over. Bieber was shaken but not hurt.
Security guards at the venue in Dubai tackle the fan and dragged him off the stage without further incident.
Bieber came back to the stage to massive applause and finished the song, then came back and did an encore after a break.
Bieber finished the show and then afterwards tweeted "Dubai, nothing stops the show."
More here and video below.
http://youtu.be/eskW5Btg11s