There is a lot of footage of multiple rocket launches from the strip, one deviates from the trajectory of the others, appears to break up and then a massive explosion from Gaza. I don't know what to believe, but given how little this could possibly benefit Israel, and given Hamas using civilians as both cover and rocket launching sites, there is pretty good reason to be sceptical of what Hamas say.
I feel kinda sickened having this argument, as if 500 innocent people weren't just killed. "These murdered civlians will help me win an argument online, hurray!"
Let's all show a bit of respect.