“Few people know what SpaceX launched into space on Jan. 7 when a Falcon 9 rocket carried a secret satellite called Zuma to orbit. Now, anonymous sources say that the satellite has failed or fallen to earth—but the real story may have nothing to do with SpaceX at all.”
Source: Did SpaceX or Northrop Grumman Screw Up a Secret Satellite Launch? It’s Classified – Nextgov