Justin Bieber: Parents demand apology after late start

Hundreds of parents were forced to take their children home from a Justin Bieber concert before the singer even came on stage on Monday night, after he turned up two hours late.

Parents have demanded an apology from the global star, saying their children were upset to miss most of the performance so they could get home, as it was a school night.

The O2 Arena has apologised on the singer's behalf.