BBC Radio 1Xtra Live has been halted after a man was assaulted backstage.
The show was taking place at the Arena Birmingham on Saturday night and featured Wizkid, Aitch and DaniLeigh among the line-up.
West Midlands Police said they were alerted to an assault in the backstage area at around 10pm by the venue’s security.
Officers said the victim suffered a slash wound but did not require hospital treatment.
A statement from BBC Radio 1 said: “Following an isolated serious incident, we have had to stop 1Xtra Live in Birmingham.
“We are co-operating fully with the police to establish what has happened.”
In a further statement, it said: “We’re sorry to everyone who attended 1Xtra Live in Birmingham for the early finish; however, the health and safety of everyone involved is always our top priority.
“We are upset and saddened that something like this should happen to a guest at one of our events and we remain in close contact and continue to offer our full support.”