What should you do first when notified to implement SIP procedures?

When notified to implement SIP (Shelter-in-Place) procedures, the first priority is to notify the FPS MegaCenter. This step is essential because the FPS (Federal Protective Service) MegaCenter is the command center responsible for coordinating responses to potential threats and emergencies. By contacting them first, you ensure that appropriate resources can be mobilized and that you receive the latest instructions based on the situation at hand.

The FPS MegaCenter likely has access to critical information and can guide you on the next steps based on the specific circumstances surrounding the SIP procedures. Effective communication with this command center is crucial for maintaining the safety and security of all occupants and ensuring that the incident is managed in an organized manner.

While the other options may seem necessary, such as evacuating occupants or waiting for additional instructions, they do not provide the immediate communication and situational awareness needed to deal effectively with an emergency situation. Thus, notifying the FPS MegaCenter is the best initial action to ensure a coordinated and effective response.