Nottinghamshire Police said officers were investigating whether any criminal offences had taken place at the care home.
A spokeswoman said: "A police investigation has been launched after concerns were raised about the standard of care provided to residents at Autumn Grange in Sherwood Rise."
Police will be speaking to former residents and their families and will work closely with partner agencies to establish if any criminal offences have taken place."
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A colder start to the day with outbreaks of rain expected across Wales and southern England.
A further 85 buses are expected to arrive on Tuesday and Wednesday, with officials saying the entire operation will last at least a week.
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