The unidentified flying objects spotted in January off Newfoundland remain a mystery to the government, despite extensive scrutiny, according to Department of National Defence (DND) documents obtained by CBC News.

The documents contain grainy images of a rocket with a long, fiery tail soaring skyward. The reports rule out missiles and model rockets, but don't suggest what the images might show.

Military experts discredit the possibility of ballistic and cruise missiles. DND's Directorate of Scientific and Technical Intelligence (DSTI) assessed the images and reported: "The object is not a ballistic missile, not a cruise missile in boost phase nor a cruise missile in-flight phase. It is also not a licensed model rocket launcher."

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