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There is no evidence that hundreds of people were killed. The EU believes the death toll to be between 10-50.
https://www.nytimes.com/2023/10/19/world/middleeast/gaza-hos...
I can't find the EU number, but I'll take your word for it.
It's entirely possible the death toll is lower. I don't claim that we know anything for certain.
Looking at the crater left behind by the missile and the damage radius I find it very hard to believe that hundreds of people died.