Which item listed is a typical concern for responders at a terrorist attack site?

A primary concern for responders at a terrorist attack site is the presence of crowded civilian areas. Such environments pose significant challenges to emergency personnel. During an incident, high concentrations of people can complicate evacuation efforts, increase the potential for additional casualties, and hinder the ability of responders to manage the scene effectively.

Additionally, crowded areas may create conditions that lead to panic, making it difficult for both victims and responders to maintain organization and safety. The likelihood of secondary attacks, such as follow-up explosions or other threats targeting first responders and civilians alike, is also heightened in these environments.

In contrast, while high-rise buildings can present their own challenges, such as access issues or concerns about structural stability, they are not inherently the most pressing concern when considering the safety of civilians and responders in the immediate aftermath of an attack. Law enforcement presence typically aims to secure the area and assist in handling the situation, and the availability of fire suppression systems is an operational factor that responders consider after assessing the immediate risks posed by civilian crowding.