It sounds like this was well known:
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RCMP say the south end of the bridge deck sheltered a homeless encampment but it's not clear if the fire was set deliberately or the result of a campfire that got out of control.
"One of the things we're going to try and do is identify the people that were down there and chat with them as to what's taken place," said RCMP spokesman Sgt. Roger Morrow.
"Was it the homeless; were they trying to keep themselves warm, or was it someone else who was doing something more nefarious?"
Morrow said the three or four homeless camped under the bridge appeared well organized, with people's allotted areas marked out.
"They were even, if you want to use the term, policing themselves," he said.
Investigators have established they had a fire going Sunday, either for cooking or to keep warm.
Morrow said the forensic investigation may be complicated by the fact the fire department had to go back more than once to douse the fire, which could make it harder to conclude if it was an accident or arson.