Who sent a mailing with pro Ku Klux Klan and anti Martin Luther King Junior material to the Carteret County School System and two area newspapers? That's a question investigators are trying to answer. The return address on the letters says they came from Morehead Primary School. School officials say they didn't come from the school. Law enforcement officials are working with the U.S. Postal Service to see if any laws have been broken. They are also trying to track down where the letters may have come from.