From CNN:GAZA CITY (CNN) -- 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.
U.N. Relief and Works Agency Director John Ging said most of the casualties were outside the school in the Jabalya refugee camp.
"It's a very built-up area, so of course it was entirely inevitable that if artillery shells landed in that area there would be a high number of casualties," he said at a U.N. briefing from Gaza City.
Palestinian sources said 44 were killed in the attack.
The Israeli military told CNN it is checking the report.
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