The downtown core lays in ruins as fire fighters continue to water smoldering rubble Sunday, July 7, 2013, in Lac Megantic, Quebec, after a train derailed ignited tanker cars carrying crude oil. The runaway train derailed, causing explosions and fires that destroyed the downtown district. (AP Photo/THE CANADIAN PRESS,Ryan Remiorz)
The downtown core lays in ruins as fire fighters continue to water smoldering rubble Sunday, July 7, 2013, in Lac Megantic, Quebec, after a train derailed ignited tanker cars carrying crude oil. The runaway train derailed, causing explosions and fires that destroyed the downtown district. (AP Photo/THE CANADIAN PRESS,Ryan Remiorz)
Canadian Prime Minister Harper, right, surveys the scene Sunday, July 7, 2013, in Lac Megantic, Quebec, as firefighters continue to spray derailed tanker cars. A runaway train derailed Saturday causing explosions of railway cars carrying crude oil and destroyed part of the downtown area of Lac Megantic. (AP Photo/THE CANADIAN PRESS, Paul Chiasson)
The downtown core lays in ruins as fire fighters continue to water smoldering rubble Sunday, July 7, 2013 in Lac Megantic, Quebec after a train derailed ignited tanker cars carrying crude oil. More bodies were recovered Sunday in the devastated town of Lac Megantic, raising the death toll to at least five after a runaway train derailed, igniting explosions and fires that destroyed the downtown district. With dozens of people reported missing, authorities feared they could find more bodies once they reached the hardest-hit areas. (AP Photo/The Canadian Press, Paul Chiasson)
Fire fighters continue to water smoldering rubble Sunday, July 7, 2013 in Lac Megantic, Quebec. A runaway train derailed Saturday igniting tanker cars carrying crude oil. (AP Photo/THE CANADIAN PRESS,Ryan Remiorz)
Burnt buildings are seen following a train derailment causing explosions of railway cars carrying crude oil Sunday, July 7, 2013 in Lac Megantic, Quebec. Two more bodies were discovered overnight after a runaway train carrying crude oil derailed in eastern Quebec, igniting explosions and fires that destroyed a town's downtown center. The confirmed death toll is now three, and is expected to rise further. (AP Photo/The Canadian Press, Paul Chiasson
LAC-MEGANTIC, Quebec (AP) ? About 40 people were still missing a day after a runaway train derailed in Quebec, igniting explosions and fires that destroyed a busy downtown district and killed five people. Police said a higher death toll was inevitable, and authorities feared the number might soar once they're able to reach the hardest-hit areas. Worries remained over the status of two oil-filled train cars.
Canadian Prime Minister Stephen Harper compared the area to a war zone and said about 30 buildings were incinerated. Quebec provincial police Sgt. Beno?t Richard said only a small part of the devastated area had been searched Sunday, more than a day since the accident, because firefighters were making sure all fires were out.
The train's 72 oil-filled tanker cars somehow came loose early Saturday morning, sped downhill nearly seven miles (11 kilometers) into the town, derailed and began exploding one by one. At least five exploded.
The eruptions sent residents of Lac-Megantic scrambling through the streets under the intense heat of towering fireballs and a red glow that illuminated the night sky. The district is a popular area packed with bars that often bustles on summer weekend nights. Police said the first explosion tore through the town shortly after 1 a.m. local time. Fire then spread to several homes.
Two tanker cars were burning Sunday morning, and authorities were still worried about them Sunday evening. Local Fire Chief Denis Lauzon said firefighters were staying 500 feet (150 meters) from the tankers, which were being doused with water and foam to keep them from overheating.
"This is an unbelievable disaster," said Harper, who toured the town Sunday. "This is an enormous area, 30 buildings just completely destroyed, for all intents and purposes incinerated. There isn't a family that is not affected by this."
The growing number of trains carrying crude oil in Canada and the United States had raised concerns of a major derailment.
One death was confirmed Saturday. Police confirmed two people were found dead overnight and confirmed two more deaths Sunday afternoon. The charred remains were sent to Montreal for identification.
A coroner's spokeswoman said it may not be possible to recover some of the bodies because of the intensity of the blasts.
Locals were convinced the death toll was far higher than five. Anne-Julie Huot, 27, said at least five friends and about 20 acquaintances remained unaccounted for. She said she was lucky to be working that night, otherwise she likely would have been at a popular bar that was leveled in the blast.
"I have a friend who was smoking outside the bar when it happened, and she barely got away, so we can guess what happened to the people inside," Huot said. "It's like a nightmare. It's the worst thing I can imagine."
About a third of the community of 6,000 was forced out of their homes. The town is about 155 miles (250 kilometers) east of Montreal and just west of the Maine border.
Transportation Safety Board investigator Donald Ross said the black box of the locomotive has been recovered, but officials haven't been able to access much of the site.
Edward Burkhardt, the president and CEO of Rail World Inc., the parent company of Montreal, Maine & Atlantic Railway, said the train had been parked uphill of Lac-Megantic because the engineer had finished his run. The tanker cars somehow came loose.
"We've had a very good safety record for these 10 years," Burkhardt said. "Well, I think we've blown it here."
Joe McGonigle, Montreal, Maine & Atlantic's vice president of marketing, said the company believes the brakes were the cause.
"Somehow those brakes were released, and that's what is going to be investigated," McGonigle said in a telephone interview Sunday. "We're pretty comfortable saying it is the brakes. The train was parked, it was tied up. The brakes were secured. Somehow it got loose."
Lauzon, the fire chief, said firefighters in a nearby community were called to a locomotive blaze on the same train a few hours before the derailment. Lauzon said he could not provide additional details about that fire since it was in another jurisdiction. McGonigle confirmed the fire department showed up after the first engineer tied up and went to a local hotel. Someone later reported a fire.
"We know that one of our employees from our engineering department showed up at the same time to assist the fire department. Exactly what they did is being investigated so the engineer wasn't the last man to touch that train, we know that, but we're not sure what happened," McGonigle said.
McGonigle said there was no reason to suspect any criminal or terror-related activity.
The train's oil was being transported from North Dakota's Bakken oil region to a refinery in New Brunswick. Because of limited pipeline capacity in the Bakken region and in Canada, oil producers are increasingly using railroads to transport much of the oil to refineries.
The Canadian Railway Association recently estimated that as many as 140,000 carloads of crude oil will be shipped on Canada's tracks this year ? up from just 500 carloads in 2009. The Quebec disaster is the fourth freight train accident in Canada under investigation involving crude oil shipments since the beginning of the year.
Harper has called railroad transit "far more environmentally challenging" while trying to persuade the Obama administration to approve the controversial Keystone XL oil pipeline from Canada to the Gulf Coast. Greenpeace Canada said Sunday that federal safety regulations haven't kept up with the enormous growth in the shipment of oil by rail.
"We think it is safe. We think we have a safe operation," McGonigle said of carrying oil by rail. "No matter what mode of transportation you are going to have incidents. That's been proven. This is an unfortunate incident."
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Associated Press writer Rob Gillies and Charmaine Noronha contributed from Toronto.
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