AlHijjah 18, 1433, Nov 3, 2012, SPA -- U.S. Secretary of State Hillary Rodham Clinton has condemned the murder of an off-duty prison officer in Northern Ireland by suspected dissident Irish Republican Army militants opposed to the country's peace process. David Black, 52, died when his car was ambushed by gunmen on a motorway Thursday. His murder was the first of a prison officer in the region since 1993, dpa reported. "There is no justification for this outrageous and cowardly act," Clinton said late Friday in a statement. "I offer my sincere condolences to the family, friends and colleagues of officer Black." "The United States remains resolute in support of the people of Northern Ireland, who have condemned violence and embraced the path to peace and reconciliation," she said.