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A highly damaged house after the October 7 Hamas attack.
An estimated 1,200 Israelis were killed in a Hamas attack on October 7. Eyal Bartov/Alamy

Why Israel’s intelligence chiefs failed to listen to October 7 warnings – and the lessons to be learned

Shortly after the Hamas attack on Israel on October 7, when an estimated 2,000 Hamas fighters breached the Israel-Gaza border in 29 different places, the Israeli security establishment allowed a narrative to form that it had very little or no intelligence about the invasion.

In the immediate aftermath of the invasion , where 1,200 people were killed, this seemed surprising, particularly because of the reputation of Israel’s intelligence services.

An intelligence agency’s failure to collect information on an enemy’s specific intentions can have huge consequences. These failures can be excusable when the hostility between the two sides is so stark that it hinders collection and makes it vulnerable to misdirection.

However it is becoming clear that Israeli military intelligence had collected specific information on how Hamas could invade. Additionally, they had evidence of what assets and techniques Hamas were likely to use, and what Israeli facilities and possessions would be targeted. From, observing rehearsals, they also had information about the level of violence Hamas terrorists were willing to inflict.

Evidence suggests that about a year ago Israeli analysts had a copy of the Hamas attack playbook, the Jericho Wall document. This detailed how Hamas fighters would breach the border using paragliders, drones and rockets, and what they would seek to attack. The October 7 invasion was a very close copy of this plan.

Read more: Gaza war: Hamas's web of allies in the October 7 attacks makes ending the conflict much harder for Israel

An intelligence unit had also observed a rehearsal exercise in Gaza City, and drawn the document and exercise together to correctly assess the relevance of both. The analyst had shown remarkable insight when she suggested to her superiors that the rehearsal was not for a raid, but an invasion, according to evidence collected by the New York Times.

Why was the correct assessment overlooked?

The assessment about Hamas appears to have been dismissed for three key reasons.

First, a belief that Hamas did not have the capabilities to carry out the attack, nor the intention to do so because it would fall outside of their historic pattern of behaviour.

Second, these beliefs about Hamas were not thoroughly challenged within Israeli intelligence nor through sharing the assessment with international partners who might have had useful intelligence on this.

Third, Israeli defences, be they deeply buried sensors, walls, or automatically defended sections of the border, were considered to be too strong for Hamas.

It is not clear from the information that has come to light so far whether the accurate intelligence assessment about Hamas was shared with the prime minister’s office, or with international allies, such as the US.

A Star of David made out of sunflower heads on the floor in front of photo portraits on sticks.
An installation commemorating the festival goers who were killed in the Hamas attack on October 7. Eddie Gerald/Alamy

What can intelligence agencies learn from this?

This Israeli failure will be relatable for intelligence agencies around the world. Intelligence analysis is difficult to do accurately, and failures can have huge consequences.

Assumptions and biases need to be constantly challenged. The question that needs to be asked is: under what circumstances could this group mount such an attack?

This form of oppositional thinking is both basic and essential. Historical examples, such as Stalin’s rejection of clear intelligence around Germany’s imminent invasion (known as Barbarossa), or US groupthink around the attempt to unseat Fidel Castro, known as the Bay of Pigs, are prominent cases.

There are two elements of an intelligence assessment: the first is what people, skills, finance and equipment does the adversary possess (capabilities) and, second, what does the adversary want to do with these assets (intentions).

If analysts believed that Hamas could not behave in this way, they would tend to look for intelligence that reinforced that view, and exclude intelligence that refuted it. Some of this “groupthink” might have been diluted if Israel’s intelligence had been shared with allies who have larger groups of analysts and different intelligence sources.

The Five Eyes intelligence network (security information shared by Australia, New Zealand, US, UK and Canada) was formed to provide this challenge function.

Over confidence?

Intelligence failures often rest on human and technological frailties. Israel’s border defence provided analysts with too much confidence in their ability to defend, regardless of whether of they could identify the threats ahead of time. Similarly, failing to see that an adversary is adapting and evolving, and what that might mean for a threat is a large threat to national security.

Getting too comfortable with biases and assumptions is dangerous. There are well-worn methods that create systems to ensure constant challenge. It is not clear whether these were not employed in this case, but the lesson is worth rehearsing regardless.

The purpose of intelligence is to provide support to decision makers. Good intelligence is clear and provides strong evidence for decisions. Failures occur often through lack of coordinated information across agencies (this was the case in 9/11).

The response in the US, UK and western security organisations has been to create intelligence fusion centres, where representatives from all the relevant agencies work in one umbrella organisation. This overcomes the problem of coordinating information between agencies.

There is no suggestion that this is only a problem in the Israeli intelligence community – quite the opposite – but is an issue in the world of intelligence generally.

Intelligence failures can show where agencies have invested too much resource, while under-investing in human intelligence or analytical techniques. These lessons are hard won, and it is a sad reality of intelligence history that strategic failures often act as drivers of reform and improvement.

All intelligence agencies seek to avoid intelligence failures ahead of time with considerable investment in recruitment, training and techniques. It remains the case that the “black box thinking” – which seeks to make improvements from systematically understanding failures – is a feature of intelligence and security, even in the most capable agencies today.

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