[borissk]

Because Mossad is one of the best in the world and they were reporting of suspicions Hamas activity. An Egyptian official also warned Israel of incoming Hamas attack. The attack took years to prepare.

"The groups carried out joint drills in Gaza which closely resembled the tactics used during the deadly assault - including at a site less than 1km (0.6 miles) from the barrier with Israel - and posted them on social media.

They practised hostage-taking, raiding compounds and breaching Israel's defences during these exercises, the last of which was held just 25 days before the attack."