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>> i remember hearing another one of our battalion chiefs that was near me calling for ambulances. i thought, oh, boy, this is not good. >> officials believe the massive explosion is caused by a back draft that ignited the volatile magnesium dust. >> the degree of smoke, the color of it, the way it was puffing out of the building, it had all the right looks and the right recipe for that to just instantaneously blow. >> cameraman matt armitage is shooting the explosion for indiana's news channel. >> all of a sudden smoke started pouring out of the building all at once. that's when i started rol...

Was near me calling for ambulances. i thought, oh, boy, this is not good. >> officials believe the massive explosion is caused by a back draft that ignites the volatile magnesium dust. >> the degree of smoke, the color of it, the way it was puffing out of the building, it had all the right looks and the right recipe for that to just instantaneously blow. >> cameraman matt armitage is shooting the explosion for indiana's news channel. >> all of a sudden smoke started pouring out of the building all at once. that's when i started rolling on it. >> seconds later the building erupts. >> a huge boo...

I need rescue. >> the force of the explosion blows firefighters to the ground. >> i remember hearing another one of our battalion chiefs that was near me calling for ambulances. i thought, oh, boy, this is not good. >> officials believe the massive explosion is caused by a back draft that ignited the volatile magnesium dust. >> the degree of smoke, the color of it, the way it was puffing out of the building, it had all the right looks and the right recipe for that to just instantaneously blow. >> cameraman matt armitage is shooting the explosion for indiana's news channel. >> all of a sudden s...

Blows firefighters to the ground. >> i remember hearing another one of our battalion chiefs that was near me calling for ambulances. i thought, oh, boy, this is not good. >> officials believe the massive explosion is caused by a back draft that ignited the volatile magnesium dust. >> the degree of smoke, the color of it, the way it was puffing out of the building, it had all the right looks and the right recipe for that to just instantaneously blow. >> cameraman matt armitage is shooting the explosion for indiana's news channel. >> all of a sudden smoke started pouring out of the building all ...

Was near me calling for ambulances. i thought, oh, boy, this is not good. >> officials believe the massive explosion is caused by a back draft that ignited the volatile magnesium dust. >> the degree of smoke, the color of it, the way it was puffing out of the building, it had all the right looks and the right recipe for that to just instantaneously blow. >> cameraman matt armitage is shooting the explosion for indiana's news channel. >> all of a sudden smoke started pouring out of the building all at once. that's when i started rolling on it. >> seconds later the building erupts. >> a huge boo...