The trial of four former Blackwater guards accused of massacring 17 Iraqi civilians at Baghdad’s Nisoor Square is continuing this week with former employees offering an inside account of the killings. One witness described how one of his colleagues shot an unarmed Iraqi who was holding his hands up in an apparent gesture of surrender. Another said he saw people hiding in their cars, trying to shield their children, while a third recalled waving to Iraqis, telling them to duck down as his own colleagues showered the area with bullets. The trial for the 2007 massacre began last month after years of delay. The private security firm Blackwater has undergone several renaming and rebranding attempts, most recently merging with former competitor Triple Canopy under the name Constellis Holdings.