Gates were left wide open -- in the most heavily guarded and surveilled area in the world .
A clear betrayal of Israeli citizens by their own government .
In addition, the investigation found that an Israeli army helicopter that arrived on the scene following the attack was responsible for at least some of the deaths, as the helicopter mistakenly shot festival goers instead of Hamas operatives.
According to police, at least 364 people were killed at the festival. How many were killed by the army helicopter remains unknown.
