A third cache of Hamas rockets was found in a UN school in Gaza on Tuesday, the United Nations aid agency for Palestinian refugees reported. The UN condemned the stockpile, calling it a "flagrant violation of neutrality of our premises." The school was not currently in use as a shelter and the weapons have not yet been removed due to nearby fighting, the agency wrote in a report. Israeli officials charge the UN with handing back the last two unearthed weapon depots to Hamas, which in turn uses them against Israel. Meanwhile, Hamas' military leader rejected a new ceasefire, saying it would not stop until the siege was lifted.