All of a sudden everyone is an expert on WP  In Gaza even the Red Cross accepts that the intention is probably to use WP to create smoke rather than to deliberately injure the Associated Press quotes the ICRCs Peter Herby as saying Its not very unusual to use phosphorus to create smoke or illuminate a target We have no evidence to suggest its being used in any other way WP smoke rounds are not classed as an incendiary weapon either This is because the  Geneva Protocol on Incendiary Weapons specifically does not cover Munitions which may have incidental incendiary effects such as illuminants tracers smoke or signaling systems  the case put forward by Human Rights Watch and others is not that WP is an incendiary but that its use violates the requirement under international humanitarian law to take all feasible precautions to avoid civilian injury and loss of life This looks like a reference to a different treaty the  Geneva Protocol which has a section on General protection against effects of hostilities httpblogwiredcomdefensewhitephosphoruhtml