"I hope that decision will be the right one," he said after meeting Israeli President Shimon Peres late Thursday.

In addition to the attack on the U.N. headquarters, Israel shells landed next to a U.N. school in another Gaza City neighborhood, wounding 14 people who had sought sanctuary there, medics and firefighters said.

An Israeli attack near a U.N. school in northern Gaza earlier this month killed nearly 40 people. At the time, Israel said militants had fired on army positions from the area.

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Barzak reported from Gaza City; Torchia from Jerusalem. Associated Press writers Diaa Hadid, Karin Laub and Ian Deitch contributed to this report from Jerusalem.