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Israeli fighter jets hit targets in the Gaza Strip minutes after a weeklong truce expired on Friday, as the war with Hamas resumed in full force.
Black smoke billowed from the besieged territory and Israel dropped leaflets over parts of southern Gaza urging people to leave their homes, suggesting it was preparing to widen its offensive.
Renewed hostilities heightened concerns for the about 140 hostages who remain in Gaza, after more than 100 were freed as part of the truce.
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The collapse of the cease-fire came a day after US Secretary of State Antony Blinken met with Israeli officials and urged them to do more to protect Palestinian civilians as they seek to destroy Hamas.
Blinken was on his way Friday to the COP28 climate talks in Dubai, where he was to meet with Arab and other leaders.
It was not clear to what extent Israeli Prime Minister Benjamin Netanyahu will heed the appeals of the United States, Israel's most important ally.
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Netanyahu's office said on Friday that Israel "is committed to achieving the goals of the war: Releasing the hostages, eliminating Hamas and ensuring that Gaza never again constitutes a threat to the residents of Israel."
In the leaflets it dropped in southern Gaza, Israel urged people to leave homes east of the city of Khan Younis. The leaflets also warned that Khan Younis was now a "dangerous battle zone".
Hundreds of thousands of people fled northern Gaza earlier in the war, with many taking shelter in Khan Younis and other places in the south.
One of the first airstrikes on Friday destroyed a large building in Khan Younis. Moments later, residents were seen frantically searching the rubble for survivors as medics approached. One wounded person was carried away on a stretcher.
In Hamad City, a Qatari-funded housing development near the city, a strike hit an apartment in a multi-storey residential building, while other parts of the building appeared largely intact. In the refugee camp of Maghazi, rescuers clawed through the rubble of a large building hit by warplanes. A foot stuck out of the tangle of concrete and wiring.
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Ashraf al-Qidra, a spokesperson for the Health Ministry in Hamas-controlled Gaza, said 14 people had been killed and dozens wounded in the first hours of Israeli attacks after the truce ended.
Israel has said it is targeting Hamas operatives and blames civilian casualties on Hamas, accusing the militants of operating in residential neighbourhoods. Since the war erupted October 7, in response to a deadly Hamas attack on southern Israel, many of those killed in Israeli bombardments have been women and children.
In Israel, sirens warning of incoming rockets blared at several communal farms near Gaza, a sign that Hamas also resumed attacks, but there were not reports of hits or damage.
Netanyahu said the war resumed because Hamas had violated the terms of the truce. "It has not met its obligation to release all of the women hostages today and has launched rockets at Israeli citizens," he said in a statement.
Palestinians in Gaza have called for a permanent end to the war, saying the temporary truces don't resolve the humanitarian catastrophe in the territory. More than 1.8 million people have fled their homes, with more than 1 million sheltering in UN schools and struggling to find basic items including cooking gas and flour.
