UN chiefs shocked, outraged at attack on UN school in Gaza and demand immediate cease-fire

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Top U.N. officials are expressing shock and outrage at an attack on a U.N. school in Gaza that killed 16 people and injured more than 100.

Deputy Secretary-General Jan Eliasson reiterated Secretary-General Ban Ki-moon's demand for an immediate cease-fire in the escalating war between Israel and Hamas.

Eliasson expressed "shock and dismay" at the attack Wednesday morning and said an initial assessment by the U.N. agency for Palestinian refugees blamed Israeli artillery. He noted that an Israeli spokesman said Israel responded to mortar fire in the vicinity of the school.

Eliasson said U.N. Secretary-General Ban Ki-moon, who is in Costa Rica, condemned the attack in the strongest possible terms, calling it "outrageous" and "unjustifiable."

More than 3,000 civilians had sought shelter at the school.