Five workers at a South Yorkshire care home have been suspended after an elderly woman died.
The woman passed away at Lord Hardy Court care home in Rawmarsh, Rotherham, after she was thought to have gone into a coma.
Rotherham Council, which runs the home, has launched an investigation.
The suspensions are over allegations the woman was left for 24 hours, because staff thought she was asleep.
The Care Quality Commission has expressed concern it was not told of the suspensions and the investigations.
The CQC said it needed assurances that standards of care would be maintained given the suspensions.
Rotherham Council said it had twice notified the independent regulator and invited inspectors to a safeguarding meeting in Rotherham on June 13.
Lord Hardy Court is one of two 60-bed residential care homes run by Rotherham Council, the other being Davies Court in Dinnington.
It looks after frail elderly people with dementia and mental health problems.
Rotherham Council is restructuring care at both homes - with up to 70 staff facing redundancy.
A spokesman for Rotherham Council confirmed the five staff at Lord Hardy Court Residential Home have been suspended, as a neutral act, over a safeguarding issue while investigations go on.