The information is based from FBI data compiled over a 10-year period regarding all law enforcement personnel killed when answering burglary-in-progress calls. The research revealed that 70 percent of the police officers killed were attacked outside the structure, 68 percent were killed at a commercial burglary scene, that 66 percent were responding to a silent alarm, and that 81 percent of the fatalities during commercial burglaries occurred at night. Twenty-four percent of the police officers were killed by an additional suspect that the police officer did not realize was present. Many suspects used deception when questioned by the police. The most important risk factor for the 30 percent of the police killed inside a building was being alone. Police officers are advised to expect danger during these calls, to be suspicious, to keep a defensive posture, to try to have backup, and to be alert for a surprise attack. Printed synopsis, statistical summary, instructions to trainers, questions, and discussion topics