Pop sensation Justin Bieber is in hospital, after he fainted during his gig at the O2 Arena last night.
Bieber's manager Scooter Braun came on stage during the performance to explain what was going on.
One fan told Daybreak "we were worried about him," she said, "but at the same time I payed really good money, and I was really disappointed he didn't come out and play the whole set."
Justin Bieber left the stage of the O2 Arena mid-song, amateur footage shows. He is currently recovering in hospital.
Warning: This footage contains flashing images
Justin Bieber is recovering in hospital after he fainted during his gig at the O2 Arena last night.
He posted a picture of himself on Instagram from his hospital bed and said he was "getting better listening to Janis Joplin."
Singer Justin Bieber was rushed off stage at the O2 during his concert, after apparently suffering from breathing problems.
In a Twitter post the Canadian pop sensation said he was "getting better."
Canadian teen pop star Justin Bieber collapsed on stage from shortness of breath during his performance at the O2 Arena last night, representatives for the singer said. Bieber's spokeswoman Melissa Victor said:
Bieber was performing for the third out of four nights at London's O2 Arena as part of the European leg of his sold-out "Believe" world tour.
Canadian pop sensation Justin Bieber rushed off stage at the O2 during his concert this evening, after apparently suffering from breathing problems.
His manager Scooter Braun came on shortly after he left the stage to explain what was happening to his thousands of worried fans, many of whom had taken to Twitter to report the star had "collapsed."
His manager said his doctors backstage asked him not to continue the show, but he insisted, and returned to the stage, much to the relief of his fans.
Online ticketing site Viagogo said it had seen an increase in the number of people who had put their seats up for sale in the wake of the singer's late appearance.
The firm said it had seen a 48% rise in listings for his tickets this morning, many trading for less than half the box office price.
Viagogo spokesman Ed Parkinson said: "It seems that parents with younger children have been frightened off by the chance of their kids being kept up beyond their bedtimes, or missing the last trains home."
Lisa Knight told ITV News that she paid £300 for a pair of tickets to Justin Bieber's London concert last night but her 10-year-old daughter was left disappointed after a near two-hour delay.
In this video recorded on Lisa's mobile phone, frustrated fans are heard booing as the Canadian superstar kept the crowd waiting.
The mother said she and her daughter arrived home in Basildon at 1.30am this morning and the 10-year-old went to school tired ahead of her SATs exams.