From the analysis of the @IDF operational systems, an enemy rocket barrage was carried out towards #Israel, which passed in the vicinity of the hospital, when it was hit.
According to intelligence information, from several sources we have, the Palestinian Islamic Jihad is responsible for the failed launch that hit the hospital. source
There is also some Al Jazeera footage that shows a rocket either failing or being intercepted, and then shortly afterwards a giant explosion on the ground below which is allegedly the Gaza hospital in question.
Or it might have been an accident, or "a rocket ...being intercepted" as AoV implied. Frankly I'm surprised we're making such a big deal over 500 casualties since Israel made it sound like they were going to go all Dresden on Gaza today. This is the Nakba?
I wonder if it's cheaper instead of using jets, get some howitzers and just do that.
If you're already calling for leveling the place, do it quick than allowing the slow death by starvation and illness because Hamas nicked everything after the seige.