Hamas did not premeditate music festival attack, some killed by friendly fire, Israeli investigators find

Israel's investigation into the Hamas movement's 7 October attack has determined that the group likely did not know about the music festival that was targeted before the attack was launched. 

Investigators said that the target for Hamas' attack seemed to be a Kibbutz, but changed plans once the festival was discovered, Israel's Haaretz newspaper reported on Saturday. 

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.