A spokeswoman for Nottinghamshire Police, said: "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."
"A police investigation has been launched after concerns were raised about the standard of care provided to residents at Autumn Grange."
Nearly 30 residents were moved out of a Nottingham care home today after "serious concerns" about the standard of care provided.
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Most will have a pleasant and dry evening, though the odd light shower is possible.
Remaining mostly dry tonight.
The victim remains critically ill in hospital.