CNN —A day after a deadly blast tore through Al-Ahli Baptist Hospital in Gaza, sparking protests across the region, the United States has released its own assessment of what caused the devastation. Islamic Jihad – a rival group to Hamas – has denied responsibility. Here’s a look at what we know – and don’t know – so far. Dr. Fadel Na’eem, head of the orthopedic department, said he was performing surgery when a deafening blast sounded through the hospital. Israel has provided the US with intelligence it has gathered related to the deadly Gaza hospital explosion, according to an Israeli official and another source familiar with the matter.

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