Fire that killed 4 soldiers at Canada military base was sparked by live grenade exercise

The major grass fire which killed four soldiers and left dozens injured at a Canadian military base in Alberta was sparked by an exercise using live grenades, Brigadier-General Vanessa Hanrahan said. "A change in wind direction and velocity significantly increased the fire's intensity," she added. Because the blaze was in the "permanent danger area", firefighters couldn't battle it directly.