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- Animals fall victim to the same effects of the attack as humans, and they are more likely to die of untreated injuries near to the place they were exposed. 
- The casualties who are close enough to become ill may have observed the attack as it occurred. For example, people in the Tokyo subway who were exposed to the nerve gas reported that suddenly everything became dark. This is one of the symptoms of nerve agent poisoning. Even a consensus that “nothing” unusual happened might attest to the delayed effects of an NBC agent. 
- Something may appear to be out of place in the immediate area. Some agent residue may be left behind as unusual smells or spills. Concentrated liquid agent poses a grave risk to first responders who have not yet established the extent of the attack.