Canadian authorities will investigate whether a whale caused the sinking of a tourist boat that killed five Britons and left an Australian missing.
The initial probe by the Transportation Safety Board of Canada into the October 25 whale watching tragedy pointed to a wave hitting the 20 metre Leviathan II off Vancouver Island.
A report by the Maritime News Journal, however, says a whale hit the vessel.
"The TSB will look into all aspects surrounding the Leviathan II accident," TSB spokesperson Julie Leroux told AAP on Monday.
The TSB said last week most of the passengers and crew on board the vessel were on the left side of the top deck, which would have raised its centre of gravity, and a wave then approached from the right side.
Asked if it was possible a whale was involved, Ms Leroux said: "It's way too early. We need to do our investigation to see what was the cause".
Despite a search by divers and boats the past week 27-year-old Sydney man Raveshan Pillay has not been found.
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