This is the best summary I could come up with:
A 20-second video which circulated on social media purporting to show the blast was the first significant piece of visual evidence to emerge of the incident.
Live footage from the Al-Jazeera media network aired at 18:59 local time showed a bright light rising in the skies above Gaza.
Justin Bronk, a senior research fellow at the Royal United Services Institute (Rusi) in the UK, agrees.
Canon Richard Sewell, the dean of St George's College in Jerusalem, told the BBC that about 1,000 displaced people were sheltering in the courtyard when it was hit, and about 600 patients and staff were inside the building.
The Israel Defence Forces (IDF) say that the absence of a large crater, or blast damage to adjacent buildings, proves that the explosion was not caused by its weapons.
The IDF has released a recording of what it says is an intercepted conversation between two Hamas militants acknowledging the hospital was hit by a projectile fired by Palestinian Islamic Jihad (PIJ).
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