A police investigation has been launched into Sunningdale House in Perranporth over safeguarding concerns.
The BBC reported that Cornwall Council had removed its residents from the home after care concerns were raised.
A Devon and Cornwall Police spokesperson said: “We are in the early stage of what is likely to be a protracted and fairly complex investigation.”
South West Care Homes, which runs the home, admitted that care at the home was not reaching its usual standards. It added that the home’s management team had been replaced.
“We are now working with the CQC and the council to reassure them that the quality of our care has returned to our exacting criteria,” South West Care Home added.
Cornwall Council said it had “taken the decision to find alternative care provision for the residents it funds at Sunningdale”.
It added: “We are working closely with families and partners and support is available for those people who fund their own care if they wish to move.”
Sunningdale, which provides residential care for up to 35 people, including those living with dementia, was rated ‘Good’ by the CQC following in its previous inspection in July 2017.
A new CQC report is expected in the coming weeks after inspectors visited the service twice in the past month.