The 2008 Urban Music Awards, which took place at the IndigO2 section of London's O2 Arena on Saturday night, descended into chaos after a man was stabbed and the venue was shut down.
The 27-year-old victim is in a critical condition in hospital, while two other people were also treated for minor stabbing injuries.
It's believed that a fight broke out about an hour into the ceremony, forcing its temporary abandonment. It continued when police allowed people back in.
Attendees criticised the minimal security at the event, with several people also reporting sightings of guns.