A BBC music event was cancelled after a rapper was stabbed backstage, three months after he launched a petition to stop drill music being criminalised.

Radio 1Xtra Live was called off early on Saturday evening after a person, not named by police, was “slashed” in the backstage area. The victim is understood to be injured but did not require hospital treatment.

The Daily Telegraph understands the victim was the rapper Krept, real name Casyo Johnson. He tweeted yesterday morning saying “I’ll be back in no time” and “can’t keep a good man down”. His manager and rapping partner Konan also tweeted to say he was fine.

The pair have previously been critical of the stance taken by police and authorities on drill music, a controversial subset of rap criticised for glorifying violence in its lyrics and videos.

Last year, Metropolitan Police commissioner Cressida Dick lobbied video sharing website Youtube take down a host of drill videos while the police have also boosted their powers to prevent rappers making violent videos.

In June, Krept and Konan launched a campaign to overturn the law in response to the prosecution of two other rappers, Skengdo and AM, for performing a song while under injunction.