Sadiq Khan, Mayor of London, has expressed sadness over the incident that took place at the O2 Academy Brixton during a show organised by Asake, a Nigerian musician.
Asake was forced to end his sold-out performance after large crowds of fans, who did not have tickets, broke into the venue.
According to reports, eight people were taken to hospital, with four in critical condition.
Reacting to the incident in a tweet on Friday, Khan said an urgent investigation is underway.
His post read, “My thoughts are with all those affected by the awful incident at Brixton Academy. Eight people were taken to the hospital, with four in critical condition.
“An urgent investigation is underway and I remain in close contact with the Met Commissioner since last night. I’m heartbroken that this could happen to young Londoners enjoying a night out in our city and urge anyone with any information to contact the police on 101.
“I won’t rest until we have the answers their loved ones and the local community need and deserve.”