Crazed fans from all over Europe have rushed into the city to see Justin perform 4 new songs tonight outside Oslo's famed opera house as part of his "Around the World" TV special.
The crowds have swelled to such overwhelming numbers, the police lost control -- and are pleading with Bieber to take the stage early ... before a riot breaks out!
Bieber's aware of the situation -- he just tweeted, "...for the show to happen u must all listen to the police. we are all concerned for your safety and i want what is best for u. please listen."
Bieber is currently in a secret location and will be helicoptered to the stage.
Developing story ....stay tuned to TMZ for more info
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