Edward Burkhardt, the CEO of Rail World Inc, has said that an employee of the company suspected of failing to engage the brakes of a runaway train has been suspended without pay.
On his first visit to the small Canadian town of Lac-Mégantic, where the blast occurred, Mr Burkhardt said it looked "like a war zone".
He also said he believes "there was no sabotage" to the train - something he is reported to have alleged earlier.
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The book by Cameron comms chief Sir Craig Oliver reveals that Mr Cameron was frustrated with Theresa May's neutrality during referendum.
Cloud and outbreaks of rain will ease away eastwards during the morning, clearing the east coast around midday with sunny spells developing.
Police and emergency services are attending the scene.