Australia's Minister for Home Affairs, Jason Clare, said an inquiry's finding of "widespread" doping in professional sport was "shocking and will disgust Australian sports fans".
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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.