Former deputy prime minister Lord Prescott has told ITV News he thinks the police should question a man who threw eggs at Labour leader Ed Miliband in south London today.
But Lord Prescott has insisted there needs to be a clear message that it is "unacceptable for public people or individuals to be assaulted simply for publicity".
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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.