The US Supreme Court ruled this week that it will not allow the four private security guards indicted in a 2007 Iraqi massacre to appeal charges related to the slaying.

Four former employees of Blackwater Worldwide — Paul Slough, Evan Liberty, Dustin Heard and Donald Ball — will once again face criminal charges for their role in the September 16, 2007 killing that left 14 Iraqi civilians dead. Twenty others were wounded during the altercation, which erupted near Nisour Square in downtown Baghdad.

The Supreme Court weighed in this week to decide on whether or not to allow an appeal that could have meant the dismissal of manslaughter and weapons charges against the employees.