Investigators – who have found nearly two dozen shell casings from a high-powered rifle – are zeroing in on two threads of possible motives centered around extremist behavior for the weekend assault on two North Carolina electric substations, according to law-enforcement sources briefed on the investigation.Investigators are taking into consideration that the timing of Moore County shootings – 7 p.m. on a Saturday night – coincided with the time a drag performance sponsored by the local LBGTQ+ community began, according to the sources.Sheriff Ronnie Fields has said whoever fired at the substations “knew exactly what they were doing.” No group “has stepped up to acknowledge or accept they’re the ones who (did) it,” the sheriff said Sunday.Investigators can enter the casings into the National Integrated Ballistic Information Network, a database from the Bureau of Alcohol, Tobacco, Firearms and Explosives.Authorities have expressed anger over the attack, with Carol Haney, mayor of Southern Pines – a town of about 15,900 residents that completely lost power – calling it a cruel"