A growing number of reported threats to power infrastructure are under investigation following attacks on substations in the South and on the West Coast as electricity becomes a more critical need in winter.Even before the gun assaults Saturday in Moore County, North Carolina, wiped out power for days to thousands, at least five electricity substations in Oregon and Washington had been attacked in November, according to energy companies.While no motive or suspect behind the North Carolina attacks has been identified, investigators are zeroing in on two possible threads centered on extremist behavior: writings by extremists on online forums encouraging attacks on critical infrastructure and a series of recent disruptions of LGBTQ+ events across the nation by domestic extremists, law enforcement sources told CNN.As the investigators continue to look for evidence and clues, detectives with the Moore County Sheriff’s Office have applied for search warrants, Maj. Andy Conway told CNN Thursday without giving details about the nature of the searches.“Both incidents are currently under investigation by the FBI,” it said, adding, “We are aware of recent threats on power systems across the country and take these very seriously.” And two Cowlitz County Public Utility District substations were vandalized in mid-November in the Woodland area, agency spokesperson Alice Dietz told The Seattle Times."