This document presents an investigative outline of the tasks that law enforcement personnel should consider at every bombing and explosion scene. The following are among the topics discussed in the guide's seven sections: (1) procuring equipment and tools (safety, general crime scene tools/equipment, scene documentation, evidence collection, specialized equipment); (2) prioritizing initial response efforts (conducting a preliminary scene evaluation, exercising scene safety, administering lifesaving efforts, establishing security and control); (3) evaluating the scene (defining the investigator's role, ensuring scene integrity, conducting a scene walk-through, securing required resources); (4) documenting the scene (developing written documentation, photographing/videotaping the scene, locating and interviewing victims and witnesses); (5) processing evidence at the scene (assembling the evidence-processing team; organizing evidence processing; controlling contamination; and identifying, collecting, preserving, inventorying, packaging, and transporting evidence); and (6) completing and recording the scene investigation (ensuring that all investigative steps are documented, ensuring that scene processing is complete, releasing the scene, and submitting reports to the appropriate national databases). Appendixes include 7 sample forms and lists of 15 references, 120 organizations that reviewed the guide, and the phone numbers and World Wide Web sites of 15 sources of investigative and technical resources. (MN)