Gazan authorities said Israeli forces shelled a shelter at a UN-run school yesterday, killing at least 15 people as the Palestinian death toll in the conflict climbed over 750 and attempts at a truce remained elusive.

United Nations Secretary-General Ban Ki-moon expressed his horror at the attack on the school at Beit Hanoun in the northern Gaza strip. “Many have been killed – including women and children, as well as UN staff,” he said in a statement. “Circumstances are still unclear. I strongly condemn this act.”

The Israeli military said its troops were fighting gunmen from Hamas, which runs Gaza, in the area and that it was investigating the incident. A spokesman for the UN relief 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.

Pools of blood lay on the ground and on students’ desks in the courtyard of the school near the apparent impact mark of the shell, according to a Reuters photographer at the scene.

There were reports of Hamas rockets falling in the area at the same time

Scores of crying families who had been living in the school ran with their children to a hospital where the victims were being treated a few hundred metres away. Laila Al-Shinbari, a woman who was at the school when it was shelled, told Reuters that families had gathered in the courtyard expecting to be evacuated shortly in a Red Cross convoy.

“All of us sat in one place when suddenly four shells landed on our heads... bodies were on the ground, (there was) blood and screams. My son is dead and all my relatives are wounded including my other kids,” she wept.

Ashraf al-Qidra, spokesman for the Gaza Health Ministry, said that as well as the 15 dead, another 200 people had been wounded in the attack. The director of a local hospital said various medical centres around Beit Hanoun were receiving the wounded.

More than 140,000 Palestinians have fled 17 days of fighting between Israel and Gaza militants, many of them seeking shelter in buildings run by the UN Relief and Works Agency (UNRWA). Israeli forces are trying to stop militants from Hamas and their allies from firing rockets into its territory.

“It’s clear that civilians are paying an unimaginable price caught between both sides,” said UNRWA spokesman Chris Gunness.

“There are reports of Hamas rockets falling around Beit Hanoun at the same time. We were attempting to arrange a window for evacuation for the civilians with the Israeli army that never came. The consequences were deeply tragic.”

Britain called on Gaza’s rulers to accept a truce unconditionally. “Hamas must agree to a humanitarian ceasefire without pre-conditions,” Foreign Secretary Philip Hammond told a news conference in Cairo as Egypt tries to mediate.

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