May 26 (UPI) -- Dozens of Palestinians were killed overnight by further Israeli air strikes on the war-torn enclave amid a breakdown in a new cease-fire agreement.

An estimated 54 Palestinians sheltering at Fahmi Al-Jargawi School in Gaza City have been killed by airstrikes carried out by the Israeli Defense Forces, the BBC reported Monday.

The scores of dead refugees included children from Beit Lahia after fires were seen engulfing two classrooms fixed as living quarters in the school, which was housing hundreds of people, according to the Hamas-run civil defense authority.

At least 35 were reported to be killed when the school was hit.

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