Israeli intelligence did detect some suspicious activity on Hamas militant networks before the attack, but the warning wasn’t fully understood or acted upon. This is similar to what happened in the US before 9/11. Intelligence analysis involves putting together a jigsaw puzzle of individual intelligence pieces to understand threats, but it's difficult for policymakers to take action based on incomplete insights. Questions include how Hamas was able to conceal sophisticated attack planning from Israeli intelligence, given Israel's capabilities, and whether Iran supported the operation as it has advanced features. Israel has effective intelligence agencies like Mossad and military intelligence, but it lacks a central intelligence coordinator for oversight, unlike the US Director of National Intelligence.