John Ging, head of Gaza operations for the agency [UN], confirmed that at least 30 people died and 55 were injured, five critically, when three artillery tank shells landed at the perimeter of the school. He said the "indications are that these strikes originated from Israeli weapons".
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Most of the casualties in the attack in the northern Gaza town of Jebaliya, where some 350 people had taken refuge, were outside the school premises though there were some inside as well, Ging said.
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Two residents who spoke to an AP reporter by phone said the two brothers [two men named by Israel as amongst the dead] were known to be low-level Hamas militants. They said a group of militants - one of them said four - were firing mortar shells from near the school. An Israeli shell targeted the men, but missed and they fled, the witnesses said. Then a further three shells landed nearby, exploding among civilians, they said.
The three Israeli mortar shells that crashed down on the perimeter of the school struck at midafternoon local time, when many people in the densely populated camp were outside getting some fresh air, thinking an area around a school was safe.
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New Zealand Herald