GREENSBORO, N.C. — Two 18-year-olds are facing several charges after court documents say they had a homemade “plasma cannon” on the property of Smith High School in Greensboro. Solomon Caravello-Bell and Chayce Harricharan were arrested July 5, according to a magistrate’s order filed in Guilford County. Court documents show Caravello-Bell and Harricharan are charged with possession of a weapon of mass destruction, malicious use of an explosive to damage property, felony breaking and entering and possessing an explosive on educational property. According to the magistrate’s order, investigators said the suspects had a homemade plasma cannon at Smith High School. The...