Justin Bieber. Photo by Paul Morigi, Getty Images.
Pop star Justin Bieber faced a backlash after being booed by a London audience for turning up on stage around two hours late, leaving thousands of young fans waiting.
Bieber apologized with a series of tweets Tuesday, claiming that his performance was delayed "because of some technical issues."
He vowed his next concert would be on time Wednesday.
He appeared on stage shortly after 10 p.m.