(IsraelNN.com) Hamas fired mortar shells from a United Nations Relief and Works Agency (UNRWA) school in Jabalya before the IDF retaliated with aerial bombing that killed 42 children, according to an initial IDF investigation. Military spokesmen said that it appeared "a number of mortar shells were fired at IDF forces from within the Jabalya school. In response to the incoming enemy fire, the forces returned mortar fire to the source. "This is not the first time that Hamas has fired mortars and rockets from schools, in such a way deliberately using civilians as human shields in their acts of terror...