The inquest hearing into the deaths of 19 elderly residents who died in Orchid View care home in Copthorne, West Sussex, heard that some residents were given the wrong doses of medication, and were left unattended for long periods of time due to shortages of staff.
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Transport Secretary Chris Grayling believes Network Rail should share the responsibility with private train operating companies.
Two vehicles were swallowed up by the sinkhole on Sunday night, killing Dora Linda Nishihara and injuring one man.
Elliott Livingstone, aged three, spent most of his life in hospital before the operation in April.