According to reports, Jay-Z's bodyguards were involved in an altercation backstage at BBC Radio 1's Hackney Weekend.
Reports say that someone, possibly in Jay-Z and Beyonce's entourage, said something to really upset Beyonce backstage:
A source told the Metro newspaper: "Someone in the entourage said something to Beyonce to really upset her.
"Jay-Z's bouncers moved in and there was a massive ruckus. Things really kicked off as his heavies all piled in on the guy."
Is it possible someone was singing Cam'ron's "Do It Again?":