Pipe bomb
（重定向自Pipebomb）
![A tripwire-triggered pipe bomb mock-up used to train US military service personnel](/Images/godic/202502/02/Trip-wire_pipe_bomb4315.jpg")
![Different pipe bombs' appearances, from a bomb awareness report issued by the US Department of State](/Images/godic/202502/02/Pipe_bomb_024315.jpg")
![This 1886 engraving was the most widely reproduced image of the Haymarket riots. It inaccurately shows Fielden speaking, the pipe bomb exploding, and the rioting beginning simultaneously.[5]](/Images/godic/202502/02/HaymarketRiot-Harpers4315.jpg")
A pipe bomb is an improvised explosive device, which uses a tightly sealed section of pipe filled with an explosive material. The containment provided by the pipe means that simple low explosives can be used to produce a relatively large explosion, and the fragmentation of the pipe itself creates potentially lethal shrapnel.