From the Haaretz article:

A school in northern Gaza burned down on Monday, hours after humanitarian aid trucks had arrived to it, according to photos and accounts by locals. Residents of the area said Israeli soldiers had set the fire that consumed the school.

A video seen on social media on Sunday, taken by an IDF soldier, showed two Israeli armored vehicles leaving the school surroundings as it was engulfed in flames

Staff from the UN World Food Program, which sent the aid, as well as other international sources, said Gazans did not even have time to collect the aid. They said the military launched an attack in the area and soldiers had surrounded the building before the food was distributed.

The convoy, consisting of two trucks and a water tanker, was the first to be approved by the military to enter northern Gaza after a month and a half of siege. The decision followed international pressure over the failure to deliver aid to Gazans.

Witnesses said soldiers forced civilians away from the area, preventing them from collecting the aid, which was later destroyed by the fire. Reports also said civilians had been killed at the site. The soldiers involved belonged to the Rotem Battalion in the Givati Brigade, the reports said.

Other footage was posted on Thursday showing fires at schools in northern Gaza. A video from the Jabalya refugee camp showed a soldier standing in the yard of a burning school. Another video showed a large blaze in the Salah al-Din School in Gaza City, which had been serving as a shelter for refugees.