Russian military expert Vasily Fatigarov said such weapons ignite fuel clouds into fireballs reaching between 2,500 and 3,000 degrees Celsius.
The probe identified several munitions used in Gaza, including the MK-84 bomb, the BLU-109 bunker buster and the GBU-39 precision glide bomb.
It said the GBU-39 was used in the al-Tabin school strike and is designed to keep structures intact while destroying everything inside through pressure and heat.
The BLU-109 was also cited in an attack on al-Mawasi, previously designated a “safe zone”, which the investigation said “evaporated 22 people”.
Former US congresswoman Marjorie Taylor Greene questioned Washington’s role following the investigation.
“If this is true and our country supplied the weapons, these are horrific war crimes. Crimes against humanity,” Greene wrote on X.
“And our country provided such weapons? When? Most Americans do not want to pay for this or be involved in such weapons,” she added.
Dr Munir al-Bursh, director general of Gaza’s Health Ministry, said exposure to extreme heat causes bodily fluids to boil instantly, leading to tissue vaporisation.
Legal experts have warned that weapons incapable of distinguishing between civilians and combatants may constitute war crimes.
“They know these weapons do not distinguish between a fighter and a child, yet they continue to send them,” lawyer Diana Buttu said.
The investigation noted the findings come despite provisional measures ordered by the International Court of Justice and an arrest warrant issued by the International Criminal Court against Israel’s prime minister.