A Palestinian diplomat has told the United Nations’ top court that Israel is killing and displacing civilians and targeting aid workers in Gaza in a case that Israel criticized as part of its “systematic persecution and delegitimization.

The United Nations criticized Israel for its ban on aid in hearings at the International Court of Justice. Israel did not send a legal delegation and rejected the proceedings as biased.

The U.N. had asked the International Court of Justice for an advisory opinion on Israel’s obligations to facilitate aid under international law.