Lebanese President Emile Lahoud has repeatedly accused Israel of using phosphorus bombs in its offensive.
Human Rights Watch, which has accused the Israeli army of using cluster bombs in populated areas of southern Lebanon, said it had not verified claims that Israel had used phosphorus.
"We are investigating but we haven't confirmed anything yet. We have seen phosphorus used before and we have seen it in the artillery stocks of the Israeli army in the north," said Peter Bouckaert, emergencies director at Human Rights Watch.
"Phosphorus shells do have a legitimate use in illuminating the battlefield at night. The offensive use of phosphorus would be a violation of international conventions."
Television footage shows some bodies, such as those of 20 civilians killed when an Israeli missile hit the van in which they were fleeing the border village of Marwaheen, blackened in the way Cham describes. No one knows what killed them.
"We are seeing abnormal burns, different from wars we've seen in the past. The corpses of these victims are shrinking to half their normal size. You think it is the corpse of a child at first but it turns out to be a grown man," said Raed Salman Zeinedine, director of Tyre Government Hospital.
"We've never seen anything like it but what the causes are I don't want to speculate. We have no scientific answer."
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