I don't have an official sources but media outlets are on it, my friends who were at the show and everyone else tweeted that 2 men just jumped on stage and attempted to hit him, that didn't work though.
They broke his piano!
2 months ago when Bieber was meant to play Muscat, Oman there were 2 kids who opened up a page threatening to blow the place up.
As if Muslims aren't getting enough love in the media.
