An investigation is under way after the death of a man at the Royal Lancaster Infirmary.
Police were called to the hospital at 5.13pm on Saturday.
A spokesperson for Lancashire Police said they had been called to support prison officers who were already present guarding a prisoner, a man in his 30s, who had become unwell and agitated.
The spokesperson said officers arrived at 5.20pm and supported HM Prisons colleagues in restraining the man, but at 5.27pm the man’s medical condition worsened, and he stopped breathing and became unconscious.
"He was given CPR, but he was sadly pronounced dead a short time later at 6.30pm," said the police spokesperson.
"Our thoughts are with his loved ones. His next of kin have been informed.
"The matter has been referred to the Independent Office for Police Conduct and they will carry out an independent investigation into the role of the police during this incident. We will of course fully cooperate with them.
"Lancashire Constabulary will retain responsibility for investigating the wider circumstances leading to the man’s death.
"We would ask that people do not speculate on the circumstances surrounding this incident until the investigation has been completed."
Praise for Lancaster and Morecambe youngsters who took part in 'tongue movement' project
Clinic where students offer free legal advice to reopen at Lancaster University
Lines reopen after train derailment on Scotland-London line
Police arrest two and seize illegal bike in Morecambe
ITV commissions sixth series of Morecambe crime drama The Bay
E-bike shop moves from Lancaster to new Carnforth showroom
Lancaster workshop to tackle the issue of drink and needle spiking
Morecambe raw feeds shop up for three 'Animal Star' awards
Two new festivals proposed for Morecambe entertainment venue the Platform
Second day of disruption as work continues after train derails in Cumbria
Morecambe lifeboat crew’s swift response rescues swimmer ‘being swept dangerously out to sea’
'Street Meets' announced to answer your questions amid new wheelie bin roll-out
Campaign group welcomes new "life changing" bus service to Morecambe
Lancaster prison worker jailed for drug offences
Major disruption as train derails on West Coast Main Line
Talks begin for events to mark Eric Morecambe's 100th birthday
Lancaster music venue due to shut will now stay open "well into 2026"
Halloween What's On Guide
LISTEN: Launch of new group in Morecambe to help with gambling addiction
LISTEN: New centre for people with disabilities to open in historic Lancaster location
