"It was mayhem. Justin narrowly missed being punched in the face when a fan tried to take a photo of him on her camera, and his minder kicked off, screaming at the girl and snatching the camera off her to delete the pic," the Mirror quoted a source as saying.
"A huge commotion broke out with the fan's male pals who tried to protect her. Fists were flying and JT was desperately trying to get out of the way. Mariah, Beyonce and her sister Solange, were petrified, not to mention Rihanna and Chris Brown who also ducked for cover as their security teams shielded them from the flying glass," the source added.