Justin Bieber told his Norwegian fans to calm down and listen to police after the mobs caused a near state of emergency.
"NORWAY - please listen to the police. I don't want anyone getting hurt. I want everything to go to plan but your safety must come first," Bieber Tweeted on May 30, adding later, "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."
The 18-year-old pop sensation is in Norway to perform a free concert in Oslo, the capital but fans enthusiasm has led the show's organizers and local police to re-consider the event.
According to Billboard magazine, Bieber was scheduled to perform six songs, including two new releases, on the roof of the Opera House for his "Around the World" TV special.
But thousands of teenage girls have put a strain on police forces and NRK news reports, that mobile use in Oslo has spiked dramatically, slowing down service for everyone. The mobile company estimates that there are 25,000 more people in the city center than on an average day.
A video can be seen below of fans running into traffic to chase a car, reportedly carrying Bieber to the venue. Though injuries have not been reported, "about 15 girls passed out" and authorities are worried that the area around the Opera will go into a state of chaos.
The Oslo police have criticized Universal Records to a lack of planning and for holding the secret concert in an area with space limitations. The pop star is scheduled to visit Paris next.
Earlier in the week, a photographer claimed that Bieber struck him in the face after he tried to take photos of the singer and his girlfriend, Selena Gomez. Los Angeles County Sheriff's Department Malibu-Lost Hills Station detectives are investigating the incident.
Bieber recently broke another YouTube record after his newest single "Boyfriend" accumulated over 8 million views in its first 24 hours online.
Bieber took to his official Twitter page on April 27 to reveal the standard and deluxe edition album covers for his upcoming album, "Believe," which is set to be released on June 19. It is Bieber's third studio album.
Watch a Norwegian broadcast of fans in Oslo below.