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It is important to be alert for suspicious parcels, but keep in mind that a mail bomb is an extremely rare occurrence. To illustrate just how rare, Postal Inspectors have investigated an average of 16 mail bombs over the last few years. By contrast, each year, the Postal Service processed over 170 billion pieces of mail. That means during the last few years, the chances that a piece of mail actually contains a bomb average far less than one in 10 billion!
Still, those who are familiar with the characteristics of suspect parcels can help to avert a tragedy. Although the appearance of mail bombs may vary greatly, here are some characteristics that have repeatedly shown up:

Mail bombs may have excessive postage. Normally a bomber does not want to mail a parcel over the counter and have to deal face-to-face with a window clerk.

The return address may be fictitious or non-existent.

The postmark may show a different location than the return address.

Mail bombs may bear restricted endorsements, such as "Personal" or "Private." This is particularly important when the addressee does not usually receive personal mail at the office.

Mail bombs may display distorted handwriting, or the name and address may be prepared with homemade labels or cut-and-paste lettering.

Parcel bombs may be unprofessionally wrapped with several combinations of tape used to secure the package, and may be endorsed "Fragile--Handle With Care" or "Rush--Do Not Delay."

Letter bombs may feel rigid, or appear uneven or lopsided.

Package bombs may have an irregular shape, soft spots or bulges.

Mail bombs may have protruding wires, aluminum foil, or oil stains, and may emit a peculiar odor.

2008-06-10 13:55:49 補充：
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