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Israel’s military resumed combat in the Gaza Strip after the end of its truce with Hamas, and accused the militant group of violating the deal. Airstrikes and gunfire were reported in the Palestinian enclave after the announcement, while sirens sounded in southern Israeli communities near the border.

Mediator Qatar said talks were ongoing to renew the pause in fighting after a weeklong truce that saw the release of more than 100 hostages held in Gaza and 240 Palestinians held in Israeli jails.

The Israeli military is now urging residents in parts of southern Gaza to evacuate, signaling that the resumption of the war would mean a broader assault. It says Hamas leaders are hiding alongside the masses of civilians who have fled south at Israel’s urging and as a result of weeks of aerial bombardment and ground battles in the north. The U.S. has urged its ally to do more to protect Palestinians in any new campaign.

More than 1.7 million people have been displaced in Gaza, where health officials say the death toll had surpassed 15,000 after weeks of Israeli attacks and new deaths were reported today. The Israel Defense Forces estimates 1,200 people were killed in the Oct. 7 Hamas attack, with around 140 people still held captive in Gaza.