A man and his daughter were driving down a rural highway in Anderson County, South Carolina, on January 30, 2018, when they noticed something odd—a glowing wicker basket in the middle of the road. The man stopped to examine the package. It exploded, causing minor burns to his leg. Among the bomb remnants police found at the scene was a piece of paper with Arabic writing referencing Osama bin Laden, leading investigators toward a possible terrorism motive. Local, state, and federal law enforcement collected evidence and sent the bomb components to the FBI Laboratory in Quantico, Virginia, where experts looked...