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"In theory one may have to wait for years to find out what happened. But in reality there is only one way Hamas could have pulled off Saturday’s massive surprise: by feeding valuable, indeed “actionable” information to individuals who were Israeli intelligence sources, even though that information allowed the Israelis to destroy rockets before they could be launched against them and achieve other such successes.
Because the destroyed rockets belonged to Islamic Jihad, which is the chief competitor for Hamas and Shia-leaning to boot (Iran pays the bills), Hamas itself paid no price to thus fill the “espionage horizon” below which yesterday’s attacks were planned."
https://www.tabletmag.com/sections/israel-middle-east/articles/israel-intelligence-failure-hamas-edward-luttwak