Letter bomb

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A mailbomb (or mail bomb), also called parcel bomb, letter bomb or post bomb, is an explosive device sent via the postal service, and designed with the intention to injure or kill the recipient when opened. They have been used in indiscriminate terrorist attacks.[citation needed] Some countries have agencies the job of which is in part the interdiction of mailbombs and the investigation of mailbombings.

Mail bombs are usually set to explode immediately on opening, with the intention of seriously injuring or killing the recipient (who may or may not be the person to whom the bomb was addressed). Parcel bombs may have excessive postage because a bomber usually does not want to mail a parcel over the counter, having to deal with a clerk, or because he doesn't want to take any risk the parcel will be returned to him for postage due. Letter bombs may feel rigid, or appear uneven or lopsided. Package bombs may have an irregular shape, soft spots, or bulges. Oil or grease stains are also indicated as warning signs.

A related threat is mail containing unidentified powders or chemicals. In some cases, these turn out to be harmless, sent as a joke or hoax threat.

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Letter-bombs, along with anti-personnel mines, are typical examples of subject-matter excluded from patentability under the European Patent Convention, because the publication or exploitation of such inventions are contrary to the "ordre public" and/or the morality (Article 53(a) EPC). [2]

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