Yeah, Hamas claimed it was an Israeli missile. Israel claims that it was a failed rocket launch by Hamas.
I don't think we actually know more than that, and everything else is people speculating for their team. But in the end, we need more information on this as statement stands against statement.
edit:
A note from the Guardian:
The Israeli military reportedly said an initial investigation suggested the explosion was caused by a failed Hamas rocket launch, but the scale of the blast appears to be outside the militant group’s capabilities.
Yeah, Hamas claimed it was an Israeli missile. Israel claims that it was a failed rocket launch by Hamas.
I don't think we actually know more than that, and everything else is people speculating for their team. But in the end, we need more information on this as statement stands against statement.
edit:
A note from the Guardian:
Reading these comments that's exactly what I was thinking. Did Hamas ever have the ability to destroy a hospital with a single missile?
No, how would they get such a large munition?