A United Nations official condemned on Saturday an Israeli shelling attack that allegedly struck a UN school in the northern Gaza Strip and killed two people. Spokesman Chris Gunness said the school was crowded with 1,600 people. He said the compound took several direct hits, and two people died. Gunness says Israel had the coordinates of the school and knew it was being used as a shelter. He said there should be an investigation into possible war crimes, and that anyone who is guilty should be brought to justice.