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

U.N. and Palestinian representatives at the International Court of Justice accused Israel of breaking international law by refusing to let aid into Gaza, on the first day of hearings about Israel's obligations to facilitate aid deliveries.