Blunt force trauma due to the wooden structures blowing away by the initial blast wave.
Fire due to all the resulting debris igniting and finishing off the wounded.
The ufos could reveal themselves and save us
Looking at the blast caused blindness, getting hit by debris and glass, and horrible burns.
Many injuries could have been avoided, and many of those had fires get the person because they were immobile.
Just as the Army taught, duck and cover, do not stand there and look at the exciting thing.