What is a critical first step when dealing with a fire scene according to proper operational procedures?

Establishing a perimeter to secure the scene is vital when dealing with a fire scene. This initial step helps to protect the area from unauthorized access, ensuring the safety of both responders and the public. A secured perimeter allows for the preservation of evidence, which is crucial for any subsequent investigation. It prevents potential contamination of the scene, which could hinder the determination of the fire’s cause. Additionally, securing the scene helps to manage the flow of personnel and equipment, minimizing confusion and maintaining order during a chaotic situation. Proper establishment of a perimeter also allows the responders to assess any ongoing risks and protect the integrity of the investigation process.