He was the son his mother boasted about: He memorized the entire Quran as a boy, and rose to the top of his university class. He wanted to become a doctor. But most of all, Shaaban al-Dalou dreamed of escape.

Since Israel launched its devastating retaliation for the Hamas-led attack just over a year ago, Mr. al-Dalou wrote impassioned pleas on social media, posted videos from his family’s small plastic tent and even launched a GoFundMe page calling out to the world for help getting out of the Gaza Strip.

Instead, the world watched him burn to death.

Mr. al-Dalou, 19, was identified by his family as the young man helplessly waving his arms, engulfed in flames, in a video that has become a symbol of the horrors of war for Gazans, trapped inside their blockaded enclave as the international community looks on.

On Oct. 14, Israel said it conducted a “precision strike” on a Hamas command center operating near Al Aqsa Martyrs Hospital in Deir al Balah, a coastal city in central Gaza. Dozens of families like the Dalous, forced to flee their homes, had set up tents in a parking lot inside the hospital compound. They had hoped that international laws forbidding most attacks on medical facilities would ensure their safety.

The Israeli military said that the fire that erupted afterward was probably caused by “secondary explosions,” without specifying what that meant. It added that “the incident is under review.”