CNN Anchor Anderson Cooper provides an in-depth look at the devastating attack on The Nova Festival near the Gaza-Israel border.

The outdoor music festival was supposed to be an all-night dance party, celebrating the Jewish holiday of Sukkot. The rockets began around 6:30 a.m. as Gaza militants fired at the hundreds of attendees. The Nova Festival was one of multiple locations hit last Saturday morning by the most sustained and coordinated assault inside Israel ever carried out by Hamas militants. At least 260 bodies would later be found at the festival site, and some attendees were taken hostage, seen in social media videos being seized by their armed captors.

Featuring new interviews with survivors and eyewitnesses of the attack and family members of kidnapped victims, Cooper breaks down everything we know so far about the deadly assault and how this surprise attack escalated into war.