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According to the Protocol III of the UN Convention on Conventional Weapons governing the use of incendiary weapons:
prohibits the use of incendiary weapons against civilians (effectively a reaffirmation of the general prohibition on attacks against civilians in Additional Protocol I to the Geneva Conventions)
prohibits the use of air-delivered incendiary weapons against military targets located within concentrations of civilians and loosely regulates the use of other types of incendiary weapons in such circumstances.
Protocol III states though that incendiary weapons do not include:
Munitions which may have incidental incendiary effects, such as illuminates, tracers, smoke or signaling systems;
Munitions designed to combine penetration, blast or fragmentation effects with an additional incendiary effect, such as armour-piercing projectiles, fragmentation shells, explosive bombs and similar combined-effects munitions in which the incendiary effect is not specifically designed to cause burn injury to persons, but to be used against military objectives, such as armoured vehicles, aircraft and installations or facilities.
There are multiple international laws that could be seen to regulate white phosphorus use. Article 1 of Protocol III of the Convention on Certain Conventional Weapons defines an incendiary weapon as "any weapon or munition which is primarily designed to set fire to objects or to cause burn injury to persons through the action of flame, heat, or combination thereof, produced by a chemical reaction of a substance delivered on the target". The same protocol prohibits the use of said incendiary weapons against civilians (already forbidden by the Geneva Conventions) or in civilian areas. The convention also defines weapons which are not to be considered to be incendiary weapons.
(i) Munitions which may have incidental incendiary effects, such as illuminants, tracers, smoke or signalling systems;
(ii) Munitions designed to combine penetration, blast or fragmentation effects with an additional incendiary effect.