A 44-year-old man has died after being restrained by Metropolitan Police officers.
He appeared to be unwell and distressed during his arrest and was taken to hospital where he later passed away, the Independent Office for Police Conduct (IOPC) said.
The man, who has not been named, died on the evening of March 19.
The IOPC has now opened an official probe into the incident, which is in its "early stages".
Met officers had responded to reports of a disturbance at an address in Haringey, London on March 18.
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There they found the now-deceased man, who appeared to be unwell and distressed, the IOPC said in a statement.
He was restrained in handcuffs and the London Ambulance Service was called.
IOPC regional director Sal Naseem said: "This is a tragic incident and our thoughts are with this man’s family and friends and all those affected by his death.
"When someone dies or is seriously injured following any form of police contact, our role is to establish all of the circumstances surrounding that incident.
"We have initial accounts from the majority of officers who were at the scene and a witness account from the man who called police to the disturbance.
"We have also gathered and viewed some of the officers’ body-worn video footage.
"Our investigation is still in its early stages and we continue to gather evidence to establish what happened.
"At this stage all of the police officers involved are being treated as witnesses."
A post-mortem examination will be held in due course, the IOPC added.
