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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The heavy showers will ease off this weekend.
Labour MPs are attempting to build a consensus for a single challenger to Corbyn, while the big game in the Tory Party is Stop Boris.
Hefty showers and longer, slow moving downpours into this evening and again on Saturday - some lively with thunder.