A Crawley care home is under investigation after allegations of irregularities over medication.
Southern Cross, which operates the Orchid View care home, said it was co-operating with Sussex Police and West Sussex Council's adult services.
The council said that its main concern was to ensure residents' needs were met and their safety was assured.
The allegations are thought to relate to a small number of people at the home in Copthorne.
Sussex Police said the investigation was in its early stages and that police, West Sussex Adult Services and the local NHS were working closely with the owners of the care home.
A spokeswoman said the investigation was look into "potential mis-application of medication".
Geraint Morgan, from Southern Cross Healthcare, said: "As this investigation is ongoing, it would be inappropriate to comment further at this stage.
"The priority for Southern Cross is, and remains, the provision of quality care to all of its residents."
A West Sussex County Council spokeswoman said: "We are and will be working with residents and their families with a view to offering residents the option to move to alternative homes where it is considered in their best interest."