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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There were calls for Carrie Lam’s resignation amid the crisis in the former British colony.
Temperatures will reach about 16C.
Negotiations in Brussels were said to have carried on until the small hours.