In the case of emergency event that threatened the cargo of an OST safeguards shipment, DOE would declare a National Security Area (NSA), which temporarily places an area under effective control of the DOE/NNSA. A National Security Area is defined as an area established within the United States and used for the purpose of safeguarding classified, sensitive, and/or restricted data to protect DOE/NNSA equipment and/or material. The CCIC at the scene will define the boundary, mark it with a physical barrier, and post warning signs. The declaration of a National Security Area does not relieve state and local authorities of their responsibilities for the area surrounding the NSA, to include evacuations or other protective actions as needed.