A nerve agent is a type of chemical weapon that targets the nervous system, specifically the neurotransmitter acetylcholine. When someone comes into contact with or is exposed to a nerve agent, it can cause severe symptoms such as seizures, paralysis, and respiratory failure, which can lead to death if not treated promptly. A "nerve agent attack" refers to an incident in which one or more individuals are intentionally exposed to a nerve agent through various means like spraying, releasing it into the air, or mixing it with other substances and applying them on surfaces. Such attacks can be carried out by terrorists, criminals, or even governments during conflicts as a way of causing mass casualties among their enemies or civilians.