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On January 9 and 10, 2009, Human Rights Watch researchers in Israel observed multiple air-bursts of artillery-fired white phosphorus over what appeared to be the Gaza City/Jabaliya area.[…]
Human Rights Watch believes that the use of white phosphorus 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.
[…]
Since the beginning of Israel’s ground offensive in Gaza on January 3, 2009, there have been numerous media reports about the possible use of white phosphorous by the Israel Defense Forces (IDF). The IDF told both Human Rights Watch and news reporters that it is not using white phosphorus in Gaza. On January 7, an IDF spokesman told CNN, “I can tell you with certainty that white phosphorus is absolutely not being used.”
http://www.mediachannel.org/wordpress/2009/01/13/mena-israel-and-the-use-of-white-phosphorous-in-gaza/