Police are continuing to question six people who were arrested on suspicion of manslaughter following the death of an elderly woman shortly after she was moved from a care home.
Ivy Atkin, 86, died on November 22 last year soon after being moved from from the Autumn Grange residential home in Sherwood Rise, Nottingham, when it suddenly closed down.
Nottinghamshire Police have arrested 11 people on suspicion of manslaughter in connection with an ongoing investigation into Ms Atkin's death.
Five have since been released on bail, pending further inquiries - two men aged 56 and 64, and three women aged 19, 20 and 28, police said.
Six others - three men aged 37, 44 and 77 and three women aged 25, 29 and 52 - remain in custody.
A Nottinghamshire Police spokesman said: "An investigation into the standard of care provided to residents at Autumn Grange is also under way and police are working closely with partner agencies to establish if any criminal offences took place."
At the start of November last year 28 residents were moved out of the privately owned home and moved to others in the area after "serious concerns" about the standard of care provided.
A spokesman for Nottingham City Council said at the time they had been made aware of issues surrounding residents' wellbeing, but could not comment on what type of concerns because a police investigation was under way.