Israel Using Experimental Explosvie in Gaza?

This story suggests that Israeli military operations have used a previously unknown explosive in Gaza.

According to The Guardian:

Photographs of some of the dead from Shifa hospital showed bodies that had been melted and blackened beyond recognition. In several cases doctors amputated badly burnt limbs.

At least 250 Palestinians have died in Gaza since the latest military operations began and hundreds more have been injured.

Neither of the doctors could give exact figures for the numbers of patients suffering the new injuries, although both said that most of those brought in during July showed signs of these injuries.

Dr Saqa'a said the injuries occurred over six weeks beginning in late June, while Dr Jouda said he believed patients admitted even in recent days still showed signs of unusual injuries.

The health ministry in Gaza reported that these injuries came from an "unprecedented type of projectile," and also noted severe burning and badly damaged internal organs. It called for an investigation into the cause of the wounds.