DEIR AL-BALAH, Gaza Strip — Israel’s military said Wednesday that the ceasefire was back on in Gaza after it carried out heavy airstrikes overnight across the Palestinian territory that killed 104 people, including 46 children, according to local health officials.

The strikes — the deadliest since the ceasefire was enacted on Oct. 10 — marked the most serious challenge to the tenuous truce to date.

Israeli Prime Minister Benjamin Netanyahu said he had ordered the military to conduct “powerful strikes” over Gaza after accusing Hamas of violating the ceasefire when the militant group handed over body parts that Israel said were the partial remains of a hostage recovered earlier in the war.

Netanyahu called the return of these body parts a “clear violation” of the ceasefire agreement, whic

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