Letter bomb

This article needs more sources for reliability. Please help improve this article by adding reliable sources. Unsourced material may be challenged or removed. Find sources: "Letter bomb" – news · newspapers · books · scholar · JSTOR (June 2020) (Learn how and when to remove this message)

A letter bomb is a bomb concealed within a letter or package, which is then sent or left for the recipient to find, typically with his or her name and address on, to be opened and then exploded, or exploded within a certain time.

The first known case of a "modern" letter bomb was the Swedish bombmaker Martin Ekenberg in August 1904. He built a bomb and sent it to a factory owner in Stockholm called Karl Fredrik Lundin. The bomb exploded but nobody was seriously injured. He sent a total of four bombs until 1907 before he was discovered.