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A chemical or biological attack or incident won’t always be immediately apparent given the fact that many agents are odorless and colorless and some cause no immediately noticeable effects or symptoms. Be alert to the possible presence of agents. Indicators of such an attack include: Droplets of oily film on surfaces Unusual dead or dying animals in the area Unusual liquid sprays or vapors Unexplained odors (smell of bitter almonds, peach kernels, newly mown hay or green grass) Unusual or unauthorized spraying in the area Victims displaying symptoms of nausea, difficulty breathing, convulsions, disorientation, or patterns of illness inconsistent with natural disease. Low-lying clouds or fog unrelated to weather; clouds of dust; or suspended, possibly colored, particles. People dressed unusually (long-sleeved shirts or overcoats in the summertime) or wearing breathing protection particularly in areas where large numbers of people tend to congregate, such as subways or stadiums
Officials feared they had been exposed to some type of biohazard and called hazmet teams to the scene but no traces of gases or chemical agents were found.
Food poisoning of some sort remains a possibility for the incident, but initially appears unlikely as those who were sick ate different meals at different times in different places before the game.