Charlotte Edwards, Digital Technology and Science Reporter Mar 11 2021, 7:59 ET Updated: Mar 11 2021, 10:38 ET FRESH analysis of a 6200 year old mass grave suggests all 41 people inside were murdered by members of their own community in a "random" massacre. The ancient grave was found in Croatia and a new study has revealed victims were of all ages from around two to 50 years old. 5 The mass grave contained 41 victimsCredit: Novak et al, 2021, PLOS One According to the study, many of the victims were killed with strikes to the skull from behind. It's unlikely a lot of them knew they were about to be attacked as there's not a lot of skeletal evidence to suggest attempts at defence.