Since the beginning of Israel’s ground offensive in Gaza on January 3, 2009, there have been numerous media reports about the possible use by the Israel Defense Forces (IDF) of white phosphorus (WP), a chemical substance used in military ordnance that has several tactical uses. The IDF has told Human Rights Watch and reporters that it is not using WP in Gaza. On January 7, an IDF spokesman told CNN, “I can tell you with certainty that white phosphorus is absolutely not being used.”
Human Rights Watch believes the IDF is using WP in Gaza. On January 9, Human Rights Watch researchers on a ridge overlooking Gaza from the northwest observed multiple air-bursts of artillery-fired WP that appeared to be over the Gaza City/Jabaliya area. In addition, Human Rights Watch has analyzed photographs taken by the media on the Israel-Gaza border showing Israeli artillery units handling fused WP artillery shells, as well as video of air bursts over Gaza followed by tendrils of smoke and flame that are highly indicative of WP use.
Israel appears to be using WP as an “obscurant” (a chemical used to hide military operations), a permissible use in principle under international humanitarian law (the laws of war). However, WP also has a significant, incidental, incendiary effect that can severely burn people and set structures, fields, and other civilian objects in the vicinity on fire. The potential for harm to civilians is magnified by Gaza’s high population density, among the highest in the world.
Human Rights Watch believes that the use of WP in densely populated areas of Gaza violates the requirement under international humanitarian law to take all feasible precautions to avoid civilian injury and loss of life. This concern is amplified given the technique evidenced in media photographs and viewed by Human Rights Watch researchers on January 9 of air-bursting WP projectiles, which spreads the burning wafers over a wider area, thereby increasing the likelihood of civilian casualties and damage to civilian objects.
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Why is WP controversial?
WP burns anything it touches. When air-burst as an obscurant, it can fall over an area about the size of a football field, about the same area affected by a cluster bomb. Those below may receive horrific skin burns, and it can set structures, fields, and other objects on fire. Using WP against military targets in densely populated areas would also raise concerns where the weapon could not be directed at a specific military target and thus would be indiscriminate in its impact, in violation of the laws of war. Humanitarian law also places restrictions on the use of incendiary weapons like WP against military personnel when other weapons are available.
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http://www.hrw.org/en/news/2009/01/10/q-israel-s-use-white-phosphorus-gaza