Ireland on Wednesday filed an official protest with Israel alleging that its senior United Nations peacekeeper in Lebanon made six telephoned warnings about IDF shelling near a UN border outpost - hours before it suffered a direct hit and the four soldiers inside were killed. Speaking after a 40-minute meeting with Israeli Ambassador Daniel Megiddo, two senior Cabinet ministers said they doubted Israel's claim that the attack was accidental. Megiddo said his government would do all it could to avoid hitting United Nations positions and firmly rejected suggestions that Israel would ever target one. "You can't forget, however, that this is a war zone," he told reporters outside the Department of Foreign Affairs, where he had been summoned. Defense Minister Willie O'Dea and Foreign Affairs Minister Dermot Ahern said what the ambassador told them was not credible.