Of those 900 calls, approximately 35 percent actually involve explosive materials or dangerous fireworks. The Bomb Squad was formed in 1950. The Bomb Squad has two bomb dogs. Explosive devices can be contained in almost anything. Bombs can be constructed to look like almost any item and can be delivered in any number of ways.
Most bombs are homemade and are limited in their design only by the imagination of their maker.
Letter and package bombs are not new. While the latest incidents have involved political terrorism, such bombs are made for a wide variety of motives. The particular form of these bombs varies in size, shape, and components. They have electric, non-electric, or other sophisticated firing systems. There are different signs that a person can look for which might indicate a possible explosive device.