Nick Harvey from aid organisation Doctors of the World, which was allegedly targeted by GCHQ, told ITV News: "We're completely shocked and surprised by these allegations of secret surveillance.
"Our doctors, nurses and midwives are by no stretch of the imagination a threat to national security so we have no idea why they would target an organisation like ourselves."
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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.