Approximately 30 minutes into the performance, a piece of moving stage equipment on which two artists were performing suffered a technical failure and fell slowly into an area where audience members were standing.
The equipment was brought in for the production and was not part of the Roundhouse structure.
The show was stopped and the performance space was cleared immediately.
A handful of injuries were reported, and whilst extremely regrettable, fortunately none of these injuries were serious.Those affected were seen by medics and four people - including one performer - were treated for minor injuries.
The Roundhouse is committed to the safety and well-being of its audiences and undertakes rigorous risk assessments for all of the shows that take place here. We are investigating what led to the issues experienced during this performance."
More top news
An exclusive poll of the capital's residents for ITV London has found Labour would make sweeping gains if an election were held tomorrow.
Research into property prices has found London has more areas with an average price of more than £1m than anywhere else in the UK.
A permanent memorial will be unveiled today in memory of murdered Middleton soldier Lee Rigby.