Justin Bieber fainted on stage while finishing his London concert at the O2 Arena on Thursday night, according to ABC News.

After the incident, Bieber's manager Scooter Braun, took to the stage and addressed the concert audience, telling them the Nothing Like Us singer experienced trouble breathing throughout the show. Braun added that Bieber was feeling "very low of breath" and, at the time of the announcement, was backstage being treated by medical personnel.

Emergency personnel backstage supplied the 19-year-old with oxygen. Bieber took a 20-minute break before returning to the stage to finish the concert and was later taken to a doctor, his spokesperson said in a statement to E! News.

On Thursday night, Bieber tweeted, "getting better. thanks for everyone pulling me thru tonight. best fans in the world. figuring out what happened. thanks for the love."

Arena sources said Bieber informed the audience that he was not feeling well before going backstage to get checked by medical personnel. He returned to the stage and finished the show despite a doctor's recommendation that he not, according to E! On Wednesday night - a day before he collapsed - Bieber was seen outside his London hotel wearing a gas mask for the second time in weeks.

On Monday, Bieber started his O2 Arena concert two hours late and upset concertgoers. He later took to Twitter to apologize, citing "technical issues" as the reason for the delay.

BBC News reported that Bieber faced angry parents who arrived at the arena expecting to pick up their children but it happened to be the same time the singer finally got on stage. Some fans booed for an hour before Bieber began the show for being treated to a string of Michael Jackson songs and no explanation for the late start.