Fifteen people have been interview under caution in a police probe into the death of 13 residents at Sussex Health Care (SHC) services.
Sussex Police said the multi-agency safeguarding investigation launched as a result of safeguarding concerns was ongoing.
The probe covers concerns over 43 residents at nine SHC services, including 13 fatalities.
A police spokesperson said: “We continue to keep families involved updated as the investigation progresses.
“We are also in consultation with the CPS but no decisions have been taken on any prosecutions at this stage.”
The BBC reported two of the 15 had been interviewed in connection with gross negligence manslaughter and 13 in connection with neglect.
A woman was arrested in connection with the investigation in November 2017 and later released (see Woman arrested in Sussex Health Care probe).
A tribunal backed enforcement action taken against SHC by the CQC in December 2018 following an appeal by the provider (see Tribunal backs CQC enforcement action against Sussex Health Care).
An SHC spokesperson said: “We have cooperated fully and openly with the police as part of their investigations and continue to do so. Where these investigations are ongoing, it would not be appropriate to comment further.”
A West Sussex County Council spokesman told CHP: “West Sussex County Council has lifted the suspension on all Sussex Health Care placements.
“However, we remain concerned about the standard and safety of care provided by some Sussex Health Care homes.
“We are working with Sussex Health Care to support ongoing improvements.
“We will continue to consider each placement on a case by case basis.”