Dozens more were killed in separate strikes in central Gaza yesterday, local reports said.
Israel's military said it made a "targeted" attack on the school in the Nuseirat camp, which it said housed a "Hamas compound".
Hamas accused the Jewish state of committing a "horrific massacre".
The major new push against the terror group in the centre of the wartorn Gaza Strip comes in the face of renewed efforts by the US to secure a lasting ceasefire.
Israel's military confirmed the strike on the school, which was housing displaced Palestinians, before key talks between American and Qatari mediators to try to finalise a peace deal.
Local sources said an Israeli warplane fired two missiles at classrooms on the top floor of the school.
Ambulances and rescue teams were seen rushing the wounded and dead to a nearby hospital.
Footage showed destroyed classrooms and bodies wrapped in shrouds at a mortuary.
Brutal
In one video, an injured woman screams: "Enough war! We have been displaced dozens of times.
"They killed our children while they were sleeping." Hamas media office director Ismail al-Thawabta denied the school had a hidden terror command post.
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Bu hikaye Daily Express dergisinin June 07, 2024 sayısından alınmıştır.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
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