A federal judge sentenced one former Blackwater security guard to life in prison and three others to 30-year terms for their roles in a 2007 shooting that killed 14 Iraqi civilians and wounded 17 others. The carnage in Baghdad's Nisoor Square caused an international uproar over the use of private security guards in a war zone. U.S. District Judge Royce Lamberth sentenced Nicholas Slatten, who witnesses said was the first to fire shots in the incident, to life on a charge of first-degree murder.