LONDON—Justin Bieber apologized Tuesday to his young fans—and their outraged, overtired parents—after they accused him of taking the stage inconsiderately late for a concert in London.

The singer insisted he had only been 40 minutes behind schedule, and blamed "technical issues."

But, he added in a tweet to his 35 million followers: "There is no excuse for that and I apologize for anyone we upset. However it was great show and I'm proud of that."

Concertgoers said the teenage star appeared onstage at the 02 Arena on Monday just before 10:30 p.m., almost two hours after the anticipated start time. Some in the audience said they faced a choice between leaving early and missing the last trains home.

"There were teenage girls crying outside," said financial analyst Louise Cooper, who had taken her 9-year-old daughter to the gig as a birthday present.

"The ladies sitting with us had to leave after 20 minutes and they had spent 70 quid (70 pounds, about $106) each on a ticket, which is really bad.

"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 attended the show with her teenage daughter, said people began booing when Bieber had not appeared by 9:30. She called the lack of explanation "disgusting."

The venue apologized on its Twitter feed "to all the Justin Bieber fans for the lateness of his show tonight.


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" But it said the subway was still running when the show ended at 11:47 p.m., and extra boats and taxis were brought in to help people leave the riverside venue.

The 02 said Bieber had actually been about 50 minutes late—he was due to come on at 9:30 and took the stage at 10:19.

Still critics said the Canadian star, who turned 19 on Friday, risked alienating fans by behaving with the same disregard for timekeeping as more hard-edged rock stars.

John Aizlewood in the Evening Standard newspaper said Bieber had shown contempt for young fans, leaving them "exhausted, disillusioned and probably late for school this morning."

Bieber, who is due to play three more nights at the venue Tuesday, Thursday and Friday, has been photographed out on the town several times during his current British tour.

"Since I have been here it hasn't been easy with the press at times but I have loved it," Bieber tweeted.

"I never have any intent to upset or let anyone down. And I'm not okay with things being exaggerated. Once again sorry for anyone upset."

He promised that he would put on a "great show" Tuesday—and it would start on time.

The 02 said Bieber was scheduled to go onstage at 9 p.m.