The London Ambulance Service was called to Liston Way at 6pm on August 7 with reports of an incident.
Ambulance crews were dispatched to the scene with an incident response officer.
London’s Air Ambulance, a charity that treats the city’s most seriously ill patients, was flown in to support colleagues.
Three people were found injured, with two suffering cut wounds.
They were taken to a major trauma centre.
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A third patient was taken to a local hospital.
Police were seen stood outside The Orchard Community Hall in Broadmead Road in connection to the incident.
The Metropolitan Police has been contacted for comment.
