Singer Justin Bieber apologized via twitter Tuesday after he showed up nearly two hours late to a London concert and was roundly booed.
He was scheduled to take the stage at 8:30 pm local time, but his message said there were technical issues.
Many young girls fell asleep and their parents just took them home. There was no explanation or apology, leading many fans to be disappointed and angry.
By the time Bieber went on stage, the arena was only half full.