Three Israeli artillery shells struck near the perimeter of a U.N. school in northern Gaza on Tuesday, killing at least 30 people and wounding 55, a United Nations official said.It was the second Israeli strike affecting a U.N. school in Gaza. Three Palestinian men, all members of the same family, were killed Monday night in Gaza City.The humanitarian situation in Gaza has deteriorated. Hundreds of wounded people swarmed into Gaza's largest hospital.
U.N. Relief and Works Agency Director John Ging said most of the casualties were outside the school in the Jabalya refugee camp.