London ( CNN ) -- Singer Justin Bieber kept thousands of fans and their tired , outraged parents up way past their bedtime Monday after arriving on stage nearly two hours late for a sold out show at London 's O2 Arena . Bieber was greeted by choruses of boos from the sell-out crowd amid scenes of tearful devastation as scores of sobbing school-aged `` Beliebers '' were hauled away minutes into the singer 's set by parents desperate to catch last trains home on a school night . .
Justin Bieber took off nearly two hours late at concert in London . Many young fans were taken home by angry parents before he finally appeared .