Originally published on July 11, 2013

The air brakes of a train loaded with 72 cars of crude oil that slammed into the Quebec township of Lac-Megantic killing at least 13 people have now become the focus of the accident investigation.

Authorities now believe the trains were not properly stabilized following a fire on one of the engines around an hour before the tragedy.

The train derailed in the early hours of Saturday morning, causing a huge explosion and fire that incinerated large areas of the town. At least another 50 people remain unaccounted for.

More than 30 buildings were incinerated in the downtown area when five of the tankers exploded, sending huge fireballs into the sky.

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