Israel has reportedly used white phosphorus near Lebanese cities and towns. What is it?

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Israel has reportedly deployed white phosphorus near Lebanese cities and towns, reigniting debate over a weapon that walks a legally ambiguous line. While international law doesn't ban white phosphorus outright, it's commonly used for smoke screens and illumination, human rights groups warn the substance can inflict severe burns and cause indiscriminate civilian casualties when deployed in populated areas. The chemical ignites at extremely high temperatures, creating dense white smoke that can obscure military movements but also blanket neighborhoods, making it nearly impossible for civilians to escape. Legal experts note that using white phosphorus as a weapon in civilian zones may violate laws against indiscriminate harm, even if the substance itself remains lawful.