A favored tactic due to its simplicity and low cost, these bombings creates maximum fear because the victims are randomly chosen, and in public areas such as schools, churches, hospitals, sporting events, bus or train stations, or other populated areas.
Unfortunately, person-borne IEDS are often shaped from a variety of metals and concealed under clothing or in backpacks so they are extremely difficult to detect. At the Boston Marathon two pressure cookers loaded with shrapnel were placed inside backpacks and left near the finish line.
