We were called just before 1.10am to a fire on Chepstow Road in Croydon.
We sent a number of staff to the scene, including five ambulance crews, our hazardous area response team, a medical team of a doctor and paramedic and a number of officers.
We were also supported by some crews and a manager from South East Coast Ambulance Service.
A total of seven patients were treated and taken to hospital, suffering from smoke inhalation.
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