Oooohs Turn to Boos as Bieber Shows Up Late for Concert Justin Bieber, who usually enjoys an adulation bordering on worship among his fans, was forced to apologize on Tuesday to concertgoers and their angry parents after he took the stage almost two hours late for a show at the 02 Arena in London, The Associated Press reported. In a message on Twitter, the singer said he was only 40 minutes late in starting the show and vaguely blamed "technical issues" for the delay. "There is no excuse for that and I apologize for anyone we upset," he said. Concertgoers told The A.P. that Mr. Bieber did not appear on stage until 10:30 p.m., two hours after the concert was supposed to start. Many parents who had accompanied their teenagers and younger children to the show faced the choice of leaving early or missing the last trains home. "There were teenage girls crying outside," said Louise Cooper, a financial analyst who had taken her 9-year-old daughter to the gig as a birthday present. She added, "It's one thing if your demographic is 50-year-olds, but his demographic is lots of little girls who need to go home and go to bed." Tracy Wilson, who went to the show with her teenage daughter, said the crowd booed when Mr. Bieber had not shown up by 9:30. No explanation was given, she said.