Justin Bieber left the stage of the O2 Arena mid-song, amateur footage shows. He is currently recovering in hospital.
Warning: This footage contains flashing images
Justin Bieber's visit to London has included illness, a late appearance and now fisticuffs after the pop star lashed out at a photographer.
Justin Bieber apologised to his young fans and their furious parents today after he turned up late for his concert last night.
Justin Bieber angered fans by showing up nearly two hours late for his London concert last night - but he's not the first musician to do so.