Canadian authorities have found evidence that a criminal act may have led to a train crash in Lac-Megantic, Quebec, that killed at least 15 people, provincial police Capt. Michel Forget said Tuesday.
There have been many questions about the crash and explosion that wiped out a swath of the town 130 miles east of Montreal. As of Tuesday evening, 35 people were still missing, Forget said.
Authorities offered no further details about the case but said it was not caused by terrorism.
"I will not speculate on the elements that we have recovered," Forget told reporters.
Investigators had earlier said that they are trying to figure out whether the train's brakes were disabled before it barreled at a dangerous speed into the Quebec town, derailed and burst into a deadly inferno.
Firefighters in the nearby town of Nantes put out a separate blaze on the train shortly before it crashed into Lac-Megantic early Saturday. Ed Burkhardt, chief executive officer and president of Rail World, the parent company of the Montreal, Maine & Atlantic Railway, has told media outlets there's evidence the engine powering the brakes was shut down at some point.
Pressed to elaborate by CTV, Burkhardt wrote Tuesday in an e-mail exchange, "We are now aware the firefighters shut down the locomotive. By the time (Montreal, Maine & Atlantic) people found out, it was too late."
In earlier comments to the Montreal Gazette, he said the matter needs further investigation, and his company has begun an internal inquiry.
"There are a number of missing pieces here," Burkhardt told the paper, saying he didn't suspect "the event was malicious or an act of terrorism."
The company did not immediately return phone calls from CNN about the report.
Asked during an earlier news conference whether authorities suspected sabotage, Ed Belkaloul, manager of rail operations for Canada's Transportation Safety Board's eastern region, said there was no evidence to that effect.
The train began rolling -- unbeknownst to dispatchers and rail traffic controllers -- about an hour after the fire in Nantes was reported. It picked up speed because the track between Nantes and Lac-Megantic lies on a 1.2% downward slope, which Belkaloul said is relatively steep.
"On the principal lines, as soon as there is an uncontrolled movement, the controllers of rail traffic can see that there is an uncontrolled movement," Belkaloul said. But on smaller lines like the one between Nantes and Lac-Megantic, "there is no way for the dispatcher or the controller to realize that there is an uncontrolled movement."
Seventy-two tanker cars carrying crude oil jumped the track early Saturday, setting off a huge fireball.
Officials in Lac-Megantic say some victims were likely vaporized by the intense blaze, which burned for 36 hours after the crash.
The fire is under control, authorities said Tuesday morning. Of the roughly 2,000 residents evacuated, about 1,200 will be permitted to return home immediately. Another 800 cannot go back yet, the officials said.
Notices were placed on doors instructing residents how to clean and air out their homes. Officials suggested throwing out any food and boiling all water because the city's water treatment plant is not operational.
Firefighters are now using infrared detectors to find any remaining hot spots in the wreckage. They've stopped hosing down the area because it was inhibiting the investigation, officials said.
Rolling oil bomb?
The train had already been on fire hours before the Saturday accident, Canadian broadcaster CBC reported, sourcing fire officials. Firefighters in the town of Nantes, seven miles northwest of Lac-Megantic, extinguished a small blaze on the freight train.