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Four people are in a critical condition after crowd trouble at a concert in south London.

People at the O2 Academy in Brixton were said to have been locked outside the venue in freezing temperatures, prompting some to try to force their way inside for the Asake gig.

The concert was eventually cancelled part-way through, with fans of the Nigerian singer told: “The reason we have to stop the show is because they have breached the doors.

“You’ve got 3,000 people have broken the doors outside and because of security the police have asked us to close the show.”

The message was met with booing before it continued: “This is nothing to do with us… There are people who’ve breached the door.

“They have broken in and security are trying to help with it.”

It is unclear if those said to have breached the doors had tickets for the event.

The O2 Academy’s website says the venue has the capacity to hold 4,921 people.

The Metropolitan Police said officers, the London Ambulance Service and London Fire Brigade were called to the scene at around 9.30pm on Thursday.

Eight people were taken to hospital, with four still in a critical condition due to injuries believed to have been caused by crushing. Others injured were treated at the scene.

One woman wrote on Twitter: “I was squashed, people stampeded in after hours of standing outside and having the doors closed. I could not breathe.”