JERUSALEM — More than 40 rockets from the Gaza Strip whizzed into Israel starting at 3 p.m. Thursday, precisely marking the designated end of the five-hour halt to hostilities both sides had agreed upon to provide a "humanitarian window" to residents after nine days of fighting.

The Israeli military said one rocket hit the southern city of Ashkelon and another fell short and landed inside Gaza, as sirens again sounded repeatedly across southern Israel. A military spokesman said Israel had not immediately resumed strikes on Gaza.

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The pause, requested by the United Nations, came after Israel foiled a predawn attack in which about 13 Palestinian militants emerged from a tunnel near a kibbutz, and as negotiations toward a Cairo-brokered cease-fire deal continued. It was interrupted by a brief flurry of mortar fire that fell in open ground near the Gaza border, but otherwise the quiet held from 10 a.m. to 3 p.m., allowing Gaza residents to safely come out of their homes to shop and survey the damage the battle had wrought.

Palestinian, Egyptian, Israeli and American officials said intense discussions were underway on terms for a cease-fire that could take effect as soon as 6 a.m. Friday, but none was willing to be quoted by name. A high-level Israeli delegation returned from Cairo, where President Mahmoud Abbas of the Palestinian Authority and Tony Blair, the envoy of the so-called Quartet of Middle East peacemakers, met Wednesday with President Abdel Fattah el-Sisi of Egypt.

"The effort to achieve an end of the violence is ongoing," said one senior Israeli official. "We're not there yet."