County has imposed a curfew, and officials are working to find a motive and suspect into the shootings that have left 40,000 customers without power

With no suspects or motive announced, the FBI is joining the investigation into power outages in a North Carolina county believed to have been caused by “intentional” and “targeted” attacks on substations that left around 40,000 customers in the dark Saturday night, prompting a curfew and emergency declaration.