Israel killed three more people near a Gaza cease-fire line on Monday, according to medics, as U.S. envoys prepared to arrive in Israel to help shore up a fragile truce that faced a major test over the weekend.

A Palestinian official close to cease-fire talks said efforts by Arab mediators and the United States would be stepped up Monday, after helping restore calm in the enclave following a day of intense bombardment that killed at least 28 people.

Israel said it launched the strikes across the enclave Sunday in response to an alleged Palestinian attack that killed two soldiers, who were operating within the agreed deployment line in southern Gaza's Rafah, in what it described as a blatant violation by Hamas of the truce.

Despite repeated bursts of violence in the week since the truce was agreed, the U.S. envoys Steve Witkoff and President Donald Trump's son-in-law Jared Kushner are expected to urge the start of the second phase of the cease-fire plan.

U.S. Vice President JD Vance was also due to visit Israel on Tuesday, Israel's airport authority said.