`` United Nations shelters must be safe zones not combat zones , '' he said . The U.N. says it thinks Jabalya artillery was behind deadly strike on school . Gaza says it is still reviewing what happened during exchange of fire with militants . `` It appears that there is nowhere where you can be safe , '' a U.N. official says . The shelling is the first time a UN facility has been hit during the Israel conflict .
The U.N. says it thinks Jabalya artillery was behind deadly strike on school . Gaza says it is still reviewing what happened during exchange of fire with militants . `` It appears that there is nowhere where you can be safe , '' a U.N. official says . The shelling is the first time a UN facility has been hit during the Israel conflict .