Hostage situation? Employee gone postal? Nope, the government was concerned with the type of wood being used in Gibson's guitars, which Gibson claims are licensed and imported appropriately from India. Gibson was raided two years ago for the same reason, and had their wood confiscated then too. No charges have ever been filed.
I guess that's what you get for manufacturing something in the US instead of India in the first place. I'm sure any companies who haven't learned that lesson already are taking note now.
Gibson's CEO explains his frustration on camera with this continued harassment and lack of due process here.