Jan Egeland’s comments came after Israel’s defense minister ordered a “complete siege” on Gaza after an unprecedented incursion by Hamas fighters into Israel early Saturday.

Israel formally declared war on Sunday and has since retaliated against Hamas for the attack.

“There is no doubt that collective punishment is in violation of international law. It’s clear as that.” Egeland told The Associated Press in a phone interview.
 
“If and when it would lead to wounded children dying in hospitals because of a lack of energy, electricity, and supplies, it could amount to war crimes.”

Egeland also slammed donor countries for halting humanitarian assistance to Gaza after the unprecedented attack by Hamas militants on Saturday.