Israel sent troops into Gaza on Friday night and has pledged to continue doing so to target tunnels and other infrastructure used by Hamas.
The substance is not banned as a chemical weapon, but it is prohibited by the Convention on the Prohibition of Use of Certain Conventional Weapons, to which Israel is not a signatory.
Gallant said that the Jewish people had not endured anything like this since the Holocaust.
Storm-Z is an unofficial term used by Russian troops, combining a term for assault troops with the letter Z, adopted by the military as a symbol of their invasion of Ukraine.
Washington has long provided Egypt with large amounts of military and other aid, ever since the Arab world's most populous nation signed a peace deal with neighboring Israel in 1979.
In the Sept. 30 crackdown, security forces killed at least 66 people, according to Amnesty International.
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