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Viral particles travel via airborne droplets of saliva, mucus and cells that make their way into a new body when their unsuspecting host breathes them in.

The frame of the helicopter continued to be hit as it became airborne, the fuel tanks were punctured.

South Korean officials said it would take more time to evaluate the effectiveness of Pyongyang's airborne early-warning aircraft.

Without soil testing, many residents worry that new buildings could be built on contaminated land, increasing the likelihood that residents and workers may be exposed to toxic chemicals by inhaling airborne dust.

"After the bomb went off my memory is pretty hazy, I just remember my vision turning red, a feeling of being airborne - I remember knowing I was dying," Paul said.