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Wikipedia definition
1. Letter bombA letter bomb, also called parcel bomb, mail 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 terrorist attacks such as those of the Unabomber. Some countries have agencies whose duties include the interdiction of letter bombs and the investigation of letter bombings.
Read “Letter bomb” on English Wikipedia
Read “郵便爆弾” on Japanese Wikipedia
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