Haaretz reports the source of a deadly attack on a United Nations-run school in Gaza on Thursday remain unclear, with the Palestinians blaming Israel for the deaths, and the Israeli army saying it does not know whether Israeli shelling or a Hamas rocket hit the facility, killing a reported 15 people. The Israeli army says the army fired mortars in the area of the UNRWA school in Gaza after Israeli troops were shot at from the area of the school. Palestinian sources said 15 people were killed when the school in Beit Hanoun was hit Thursday afternoon. An IDF Spokesman later issued a statement that it is investigating the matter of the hit on the school. UN Secretary-General Ban Ki-moon condemned the attack on the UNRWA school for Palestinian refugees in northern Gaza.