What should happen when there's a suspicion of arson at a fire incident?

When there is a suspicion of arson at a fire incident, it is crucial to notify the fire marshal right away. This is because the fire marshal is trained to investigate potential criminal activity related to fire incidents. Timely notification allows for a prompt response, which is essential for preserving evidence and initiating a thorough investigation. Evidence can deteriorate quickly, and if the scene is not secured, critical information may be lost, potentially hindering the investigation.

By alerting the fire marshal immediately, appropriate actions can be taken to gather information, interview witnesses, and assess the scene. This ensures that all necessary protocols are followed while evaluating the situation without interfering with potential evidence.

The other options suggest actions that would either diminish the seriousness of the situation, prematurely evacuate individuals without necessity, or interrupt operations without clear justification. These actions could compromise safety and the effectiveness of the investigation. Thus, notifying the fire marshal right away is the correct and most responsible course of action when arson is suspected.