Norwegian media on Friday blasted a Justin Bieber concert in Oslo as a "fiasco" after the Canadian pop star walked off the stage after just one song, leaving his teenage fans stunned and in tears.

The 21-year-old put an abrupt end to his concert on Thursday evening after performing his hit song "Boyfriend", fed up with fans throwing water on the stage.

Footage shot by fans' smartphones shows Bieber mopping the stage with a shirt and trying to reason with the young fans in the front row throwing the water.

"Never mind. I'm done. I'm not doing the show," he said before stomping off the stage, removing his sweatshirt and throwing it on the ground.

Norwegian media gave the story wide play on Friday, replaying the video clips of the incident over and over again and interviewing crying girls who had attended the show for about 1,000 people.

Channel TV2, which organised the concert, termed it a "scandal" and a "fiasco", while newspaper Adresseavisen called it a "tearful drama".

Bieber later apologised on Instagram.

"Sadly it's been a rough week for me, long days no sleep," he wrote.

"In no way did I mean to come across mean... I don't always handle things the right way but I'm human and I'm working on getting better," he added.

"Unfortunately people were affected by this as am I. For the people in the back I am so sorry and for anyone I may have disappointed I'm sorry."

Bieber once enjoyed a squeaky clean image but has more recently had run-ins with the law, including the alleged assault in 2013 of a limousine driver, who announced earlier this year that he is suing the singer.

Bieber has twice been ordered to take anger management classes -- once after admitting to taking part in an illegal drag race on a Miami street, and once for throwing eggs at the home of a neighbour, for which he was handed two years' probation.
Source: AFP