REPUBLIKA.CO.ID, GAZA/JERUSALEM - Gazan authorities said Israeli forces shelled a shelter at a UN-run school, killing at least 15 people, as the Palestinian death toll in the conflict reached 796 and attempts at a truce remained elusive.

A spokesman for the UN 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.

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.

Scores of crying families who had been living in the school ran with their children to a hospital a few hundred metres away where the victims were being treated. 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.

United Nations Secretary-General Ban Ki-moon expressed horror at the Thursday 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."

Ban later arrived at Cairo where he was expected to meet US Secretary of State John Kerry, who has been working the telephones to try to broker a truce. 

Kerry's spokesman said the school attack "underscores the need to end the violence". But there was no sign of progress on securing a ceasefire in his four days in the region. 

"Gaps remain between the parties," a senior US official said, adding that Kerry would not stay "for an indefinite amount of time."

The Israeli military said it was investigating the school incident. 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."

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

In the occupied West Bank, some 10,000 protesters marching in support of their Gaza compatriots clashed with Israeli troops and at least one protester was killed and some 200 were injured, Palestinian hospital officials said.

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