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United Nations Secretary-General Ban Ki-moon expressed horror at the Thursday attack on the school at Beit Hanoun in the northern Gaza strip. I strongly condemn this act." Ban later arrived at Cairo where he was expected to meet U.S. Secretary of State John Kerry, who has been working the telephones to try to broker a truce. Israel Defence Forces spokesman Lieutenant-Colonel Peter Lerner told Reuters TV: "It could be errant fire from the IDF or rockets landing from Gaza terrorists but we still don't know, there's still a question mark." A spokesman for the U.N. Relief and Works Agency said it had tried in vain to arrange an evacuation of civilians from the school with the Israeli army, and noted reports of Hamas rockets falling in the area at the same time.