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barrel bomb
A barrel bomb is an improvised unguided bomb, sometimes described as a flying IED (improvised explosive device). They are typically made from a large barrel-shaped metal container that has been filled with high explosives, with possibly shrapnel, oil or chemicals, and then dropped from a helicopter or airplane. Due to the large amount of explosives (up 1,000 kilograms), their poor accuracy and indiscriminate use in populated civilian areas (including refugee camps), the resulting detonations have been devastating.〔(Syria's deadly barrel bombs )〕〔(【引用サイトリンク】title=A City Left in Ruins: The Battle for Aleppo )〕〔()〕 Critics have characterised them as weapons of terror and illegal under international conventions.〔
The earliest known use of barrel bombs in their current form was by the Israeli military in 1948. The second known use of barrel bombs was by the US military in Vietnam in the late 1960s. Starting in the 1990s, they were also used in Sri Lanka, Croatia and Sudan. Barrel bombs have been used extensively by the Syrian Air Force during the Syrian Civil War—bringing the weapon to widespread global attention—and later by the Iraqi forces during the Anbar clashes. Experts believe they will continue to be embraced by unstable nations fighting insurgencies since they are cheap to make and utilise the advantages of a government's air-power.
==Description==
Barrel bombs are cheap to produce, potentially costing as little as $200 to $300. They can be used with any type of aircraft including non-military cargo planes. The explosive payload can be as simple as fertilizer (ammonium nitrate/fuel oil). The bomb may contain metal shrapnel such as nuts and bolts or even chemicals such as chlorine.〔(Evidence Chlorine Gas Was Used In The Kafr Zita Chemical Attack ), brown-moses.blogspot.com.au.〕 The bomb is barrel-shaped and might be made from improvised material or specially designed. The early versions in Syria used lit fuses and thus had to be carefully timed, otherwise they would fail to explode before breaking apart on the ground or explode too soon in the air.〔 Later models had impact fuses and stabilizing fins which were improved on over time.〔 Earlier barrel bombs also weighed less (100-300 pounds/45–150 kg), while later versions range from 1,000 pounds (454 kg) to 1 ton(ne).〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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