Personally, I think it's the white phosphorus that is an abomination. But Israel dropped that on Lebanon so it doesn't seem to be getting the same attention as bombing with other weapons in Gaza.

Israel used U.S.-supplied white phosphorus in Lebanon attack

DHEIRA, Lebanon — Israel used U.S.-supplied white phosphorus munitions in an October attack in southern Lebanon that injured at least nine civilians in what a rights group says should be investigated as a war crime, according to a Washington Post analysis of shell fragments found in a small village.

A journalist working for The Post found remnants of three 155-millimeter artillery rounds fired into Dheira, near the border of Israel, which incinerated at least four homes, residents said. The rounds, which eject felt wedges saturated with white phosphorous that burns at high temperatures, produce billowing smoke to obscure troop movements as it falls haphazardly over a wide area. Its contents can stick to skin, causing potentially fatal burns and respiratory damage, and its use near civilian areas could be prohibited under international humanitarian law.

Of the nine injured in Israel’s attack on Dheira, at least three were hospitalized, one for days.

Lot production codes found on the shells match the nomenclature used by the U.S. military to categorize domestically produced munitions, which show they were made by ammunition depots in Louisiana and Arkansas in 1989 and 1992. The light green color and other markings — like “WP” printed on one of the remnants — are consistent with white phosphorous rounds, according to arms experts.

Who knows when the US supplied it or how long Israel has been holding onto it.