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 66 women and children, according to local health officials.

The strikes, the deadliest since the ceasefire began on Oct. 10, marked the most serious challenge to the tenuous truce to date.

The bombardment pointed to Israel’s readiness to strike hard at what it says are Hamas violations of the ceasefire deal. Meanwhile the militant group denies it is responsible and blames Israel for violations.

After it announced the restoration of the ceasefire, the Israeli military said it carried out another airstrike in northern Gaza, targeting what it called a site where weapons were

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