An incident where a man has died after being arrested by police has been referred to the Independent Office for Police Conduct (IOPC).
At approximately 11:30hrs on Friday, 30 March, police stopped a car in Brandon Street, SE17.
The 26-year-old driver was detained on suspicion of being in possession of a knife. A lock knife was found in the car and the man was arrested.
He was taken to Walworth police station, where at around 12:15hrs, shortly after he arrived at the police station, custody staff called an ambulance as it was suspected he had swallowed a substance.
The man was taken by the London Ambulance Service to a central London hospital where he died on Saturday, 31 March.
A post-mortem examination will be held in due course.
The Met's Directorate of Professional Standards is investigating and a referral was made to the Independent Office for Police Conduct who have begun an independent investigation.