US intelligence had prior warnings from Israel

So why was Israel unprepared? From this report:

"The US intelligence community produced at least two assessments based in part on intelligence provided by Israel warning the Biden administration of an increased risk for Palestinian-Israeli conflict in the weeks ahead of Saturday’s seismic attack on southern Israel, according to sources familiar with the intelligence.

"One update from September 28 warned, based on multiple streams of intelligence, that the terror group Hamas was poised to escalate rocket-attacks across the border. An October 5 wire from the CIA warned generally of the increasing possibility of violence by Hamas. Then, on October 6, the day before the attack, US officials circulated reporting from Israel indicating unusual activity by Hamas — indications that are now clear: an attack was imminent."