http://news.bbc.co.uk/2/hi/middle_east/7848768.stm
"We're standing here right next to an M825A1, which is the US designation for their white phosphorus shell," he says.
"Manufactured in the US and sold to Israel, the shell here is unexploded, although it's cracked and you can see the phosphorus pouring out in kind of this yellow-orange colour."
"Around the area there are also some white phosphorus felt pieces," he adds.
"As the weapon explodes in mid-air, 116 pieces of felt doused in white phosphorus fall on a large area. These pieces are littered around here. If you kicked them open, they would begin to smoke and potentially reignite."
 |   It's important that we investigate the use of white phosphorus, because it does appear that it was used incorrectly in a clear breach of Geneva Conventions  Marc Garlasco, military analyst Human Rights Watch |
Controversial as it is, white phosphorus is not illegal, at least in an open battlefield setting, where it is used to mask troop movements, or set on fire areas of high brush that need clearing.
But the international convention on the use of incendiary weapons says it should not be used where there is a possibility of hitting civilians.
The compound sticks to human skin and will burn right through to the bone, causing death or leaving survivors with painful wounds which are slow to heal.
United Nations officials say it was used in the shelling of a school in which hundreds of civilians were taking refuge from the fighting, and fired at the UN's main headquarters in Gaza.
Eyewitnesses and victims talk of it being used on many other occasions in built-up areas.
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