The show at the Arena Birmingham on Saturday was due to include artists such as Wizkid, French Montana, Aitch and DaniLeigh.
Rapper Krept has confirmed he is “good” after reports that he was assaulted at a BBC Radio 1Xtra live event in Birmingham.
West Midlands Police said they were alerted to an assault in the backstage area by the venue’s security at about 10pm.
Officers said the victim suffered a slash wound but did not require hospital treatment, and would not comment on their identity.
The BBC apologised for calling off the event but said safety was a priority.
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.”