Israel’s military says an initial investigation into the killing of 15 emergency workers in south Gaza last month showed that the incident occurred "due to a sense of threat." But video and eyewitness evidence suggest a different story.

A CNN review of audio and video capturing the attack, photos and satellite imagery of the mass grave, along with interviews with an eyewitness, forensic experts and family members provides a detailed account of the Israeli military’s targeting and burial of clearly marked rescue crews from the Palestinian Red Crescent Society,

Israel's military says the incident is under thorough investigation. The initial account of the vehicles not having emergency lights on was mistaken, an Israeli military official told journalists.