What are general indicators of a biological or chemical attack?

The presence of dead or sick animals is a significant indicator of a biological or chemical attack. This is because many biological agents, such as pathogens used in biological warfare, can affect both humans and animals. If a biological agent is released into the environment, it may lead to sudden illness or mortality in wildlife and livestock, thereby signaling a potential threat. These changes in animal health can be alarming and may prompt further investigation into the possible causes, including the possibility of an attack.

In contrast, while increased military presence could indicate heightened alertness or preparations for a potential threat, it does not directly point to a biological or chemical attack itself. Unusual weather patterns and rising temperatures may influence the spread of diseases or the behavior of biological agents, but they are not explicit indicators of an attack. Observing dead or sick animals provides a more direct and urgent indication that a biological or chemical agent may have been released, necessitating immediate attention.