(TMZ) Police in Norway were on the verge of declaring a state of emergency in Oslo, after tens of thousands of unruly Justin Bieber fans overran the city -- and now, they're begging the singer for help.
Justin's was scheduled to perform 4 new songs last night outside Oslo's famed opera house as part of his "Around the World" TV special -- and we're told crazed Bieber fans from all over Europe descended on the city for the event.
We're told the crowds have swelled to such overwhelming numbers, the police lost control -- and are pleaded with Bieber to take the stage early ... before all hell breaks loose.
Bieber was aware of the situation -- he 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." more on this story