Officers are trying to work out the identity of a man who became 'unresponsive' in custody after being arrested for assaulting a police officer.
The man remains in a critical condition in hospital this morning, a GMP spokesman said.
The incident has been referred to GMP's Professional Standards Branch and the Independent Office for Police Conduct.
Police were first called to Quinney Crescent, Moss Side at around 1.30am today (Sunday) to reports that a man was damaging vehicles.
When cops arrived at the scene, the man was subsequently arrested on suspicion of assaulting a police officer.
It was when he was in police custody that he became unresponsive.
A spokesman for GMP said 'enquiries are ongoing to establish the man's identity'.
The man is described as possibly being of Arab descent - his head is shaven and he has a distinctive tribal-style dragon tattoo on his right shoulder and upper arm.
He is in his mid to late 30s, 5ft 9in tall and of a slim build.
The full statement from GMP said: "Police are appealing for information following an incident in Manchester.
"At around 1.30am on Sunday 20 September 2020, police were called to reports that a man was causing damage to vehicles on Quinney Crescent, Moss Side.
"Officers attended and a man was subsequently arrested on suspicion of assaulting a police officer.
"Whilst in police custody, the man became unresponsive. He was taken to hospital where he remains in a critical condition.
"Enquiries are ongoing to establish the man's identity. He is described as being possibly of Arabic descent, in his mid to late 30s, 5ft 9in tall and of a slim build. His head is shaven and he has a distinctive tribal-style dragon tattoo on his right shoulder and upper arm.
"In line with normal procedure, this incident has been referred to GMP's Professional Standards Branch and the Independent Office for Police Conduct."
Anyone with information is asked to contact police on 101 quoting 135 of 20/09/20 or the independent charity - Crimestoppers, anonymously, on 0800 555 111.
