The Independent Police Complaints Commission is investigating why the Latvian, who had suffered serious injuries to his legs prior to his arrest, wasn’t taken to hospital sooner.
When the 50-year-old was arrested on a Hull street on February 13, officers noted that the man, who lives locally, but spoke little English, had injuries to his legs.
He was seen by a nurse at a police station round 6.15pm, but was not seen by the force medical examiner until 12.45 am on February 14.
His injuries were identified later at hospital as fractures to his lower legs.
Humberside Police referred the matter to the IPCC at the time and an investigation was begun by the force’s professional standards branch supervised by the IPCC.
The IPCC has since decided to carry out an independent investigation into the man’s care and treatment.
Notices have already been served on 11 police officers and staff to advise them their conduct is subject to investigation and a custody officer has been suspended by Humberside Police.
IPCC investigators will be interviewing those involved.
The man has not been charged with any offence.
IPCC Commissioner Kathryn Stone OBE said: “This man had sustained serious leg injuries before being arrested by police and our investigation will examine why he wasn’t taken to hospital sooner.
“We will consider the decision making and assessments made by the police officers during his time in custody, and whether appropriate consideration was given to the man’s welfare. Humberside Police has acted appropriately in drawing our attention to evidence which has led to us undertaking the independent investigation.”