What is white phosphorus, and why is Israel using it in Lebanon?

What is white phosphorus, and why is Israel using it in Lebanon?

White phosphorus can cause severe burns, ignite repeatedly and produce intense heat and toxic smoke. Here’s how Israel has used it in southern Lebanon, its impact on civilians and farmland, and why its use in populated areas is restricted under international law. Al Jazeera’s Reem Takieddine explains.